Name: microwave-assisted intramolecular dehydrogenative diels-alder reactions for the synthesis of functionalized naphthalenes/solvatochromic dyes
Uploaded: 2013-04-01T13:00:00
Description: Watch this Scientific Journal Video about Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes at JoVE.com

我们感谢美国国家科学基金会（CHE0910597）和美国国立卫生研究院（P50-GM067982）为支持这项工作。我们非常感谢有益的讨论，关于荧光测量教授迈克尔·Trakselis的（匹兹堡大学）。我们承认克里斯蒂Gogick和罗宾·斯隆（匹兹堡大学），他们协助收集荧光数据。

1。微波辅助脱氢DA反应<ol><li>添加的对 - 氯苯乙烯衍生物（0.045克，0.18毫摩尔）和1,2 - 二氯乙烷（3毫升），以2-5毫升微波照射小瓶装有搅拌棒，以创建一个0.060 M溶液。这种浓度被使用，因为较高的浓度会导致形成不希望的产品。 </li><li>盖上盖子的的微波辐射小瓶，并将其放置在微波合成腔。 </li><li>照射该溶液在180℃下，在搅拌下与固定的保持时间为200分钟。保持时间是多长时间的照射下会出...

<ol>
	<li>Wender, P. A., Miller, B. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synthesis+at+the+molecular+frontier.">Synthesis at the molecular frontier.</a> Nature. 460, 197-201 (2009).</li><li>Takao, K. -. i., Munakata, R., Tadano, K. -. i. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Recent+Advances+in+Natural+Product+Synthesis+by+Using+Intramolecular+Diels-Alder+Reactions.">Recent Advances in Natural Product Synthesis by Using Intramolecular Diels-Alder Reactions.</a> Chem. Rev. 105 (12), 4779-4807 (2005).</li><li>Winkler, J. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tandem+Diels-Alder+Cycloadditions+in+Organic+Synthesis.">Tandem Diels-Alder Cycloadditions in Organic Synthesis.</a> Chem. Rev. 96 (1), 167-176 (1996).</li><li>Wessig, P., M&#252;ller, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Dehydro-Diels-Alder+Reaction.">The Dehydro-Diels-Alder Reaction.</a> Chem. Rev. 108 (6), 2051-2063 (2008).</li><li>Wagner-Jauregg, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Thermische+und+photochemische+Additionen+von+Dienophilen+an+Arene+sowie+deren+Vinyloge+und+Hetero-Analoge;+II.">Thermische und photochemische Additionen von Dienophilen an Arene sowie deren Vinyloge und Hetero-Analoge; II.</a> Synthesis. (10), 769-798 (1980).</li><li>Ohno, H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+Highly+Regio-+and+Stereoselective+Formation+of+Bicyclo[4.2.0]oct-5-ene+Derivatives+through+Thermal+Intramolecular+[2+++2]+Cycloaddition+of+Allenes.">A Highly Regio- and Stereoselective Formation of Bicyclo[4.2.0]oct-5-ene Derivatives through Thermal Intramolecular [2 + 2] Cycloaddition of Allenes.</a> J. Org. Chem. 72 (12), 4378-4389 (2007).</li><li>Stille, J. K., Chung, D. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Reaction+of+Vinylidene+Cyanide+with+Styrene.+Structure+of+the+Cycloadduct+and+Copolymer.">Reaction of Vinylidene Cyanide with Styrene. Structure of the Cycloadduct and Copolymer.</a> Macromolecules. 8 (1), 83-85 (1975).</li><li>Klemm, L. H., Klemm, R. A., Santhanam, P. S., White, D. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Intramolecular+Diels-Alder+reactions.+VI.+Synthesis+of+3-hydroxymethyl-2-naphthoic+acid+lactones.">Intramolecular Diels-Alder reactions. VI. Synthesis of 3-hydroxymethyl-2-naphthoic acid lactones.</a> J. Org. Chem. 36 (15), 2169-2172 (1971).</li><li>Klemm, L. H., McGuire, T. M., Gopinath, K. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Intramolecular+Diels-Alder+reactions.+10.+Synthesis+and+cyclizations+of+some+N-(cinnamyl+and+phenylpropargyl)cinnamamides+and+phenylpropiolamides.">Intramolecular Diels-Alder reactions. 10. Synthesis and cyclizations of some N-(cinnamyl and phenylpropargyl)cinnamamides and phenylpropiolamides.</a> J. Org. Chem. 41 (15), 2571-2579 (1976).</li><li>Ozawa, T., Kurahashi, T., Matsubara, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dehydrogenative+Diels-Alder+Reaction.">Dehydrogenative Diels-Alder Reaction.</a> Org. Lett. 13 (19), 5390-5393 (2011).</li><li>Chackalamannil, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+facile+Diels-Alder+route+to+dihydronaphthofuranones.">A facile Diels-Alder route to dihydronaphthofuranones.</a> Tetrahedron Lett. 41 (21), 4043-4047 (2000).</li><li>Ruijter, E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synthesis+of+Polycyclic+Alkaloid-Type+Compounds+by+an+N-Acyliminium+-Pictet-Spengler/Diels-Alder+Sequence.">Synthesis of Polycyclic Alkaloid-Type Compounds by an N-Acyliminium -Pictet-Spengler/Diels-Alder Sequence.</a> Synlett. 2010, 2485-2489 (2010).</li><li>Toyota, M., Terashima, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+novel+synthesis+of+the+basic+carbon+framework+of+fredericamycin+A.+Promising+routes+for+the+spiro+chiral+center+construction+of+the+CD-ring+system.">A novel synthesis of the basic carbon framework of fredericamycin A. Promising routes for the spiro chiral center construction of the CD-ring system.</a> Tetrahedron Lett. 30 (7), 829-832 (1989).</li><li>de Koning, C. B., Rousseau, A. L., van Otterlo, W. A. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Modern+methods+for+the+synthesis+of+substituted+naphthalenes.">Modern methods for the synthesis of substituted naphthalenes.</a> Tetrahedron. 59 (1), 7-36 (2003).</li><li>Johnson, I., Spence, M. T. Z. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> The Molecular Probes Handbook, A Guide to Fluorescent Probes and Labeling Technologies. , 1051 (2010).</li><li>Fern&#225;ndez-Su&#225;rez, M., Ting, A. Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fluorescent+probes+for+super-resolution+imaging+in+living+cells.">Fluorescent probes for super-resolution imaging in living cells.</a> Nat. Rev. Mol. Cell. Biol. 9 (12), 929-943 (2008).</li><li>Kappe, O. C., Dallinger, D., Murphree, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Practical Microwave Synthesis for Organic Chemists. , (2009).</li><li>Kocsis, L. S., Benedetti, E., Brummond, K. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+Thermal+Dehydrogenative+Diels-Alder+Reaction+of+Styrenes+for+the+Concise+Synthesis+of+Functionalized+Naphthalenes.">A Thermal Dehydrogenative Diels-Alder Reaction of Styrenes for the Concise Synthesis of Functionalized Naphthalenes.</a> Org. Lett. 14 (17), 4430-4433 (2012).</li><li>Benedetti, E., Kocsis, L. S., Brummond, K. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synthesis+and+Photophysical+Properties+of+a+Series+of+Cyclopenta[b]naphthalene+Solvatochromic+Fluorophores.">Synthesis and Photophysical Properties of a Series of Cyclopenta[b]naphthalene Solvatochromic Fluorophores.</a> J. Am. Chem. Soc. 134 (30), 12418-12421 (2012).</li><li>OriginLab Corporation. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Origin 8 User Guide. , (2007).</li></ol>

微波辅助脱氢DA反应 DA反应的分子内脱氢，苯乙烯基前体的微波辐射（MWI）在71-100％的高收益率和较短的反应时间产生不同的萘结构，需要短短的30分钟（ 图1）18。最困难的方面的进行脱氢DA反应是溶剂的选择，这往往是复杂的，因为需要考虑到各种溶剂的特性，以确保最佳的加热。第一和最重要的是，一个成功的反应必须有可能在溶剂中，是与微波条件兼?...

小分子设计和合成一系列的科学领域，包括医药，农药，有机染料和多1的发展是至关重要的。 （DDA）的Diels-Alder（DA）和脱氢的Diels-Alder反应是在小的环状和芳族化合物2-4的合成，尤其是强大的工具。此外，热脱氢DA反应苯乙烯二烯，炔烃的亲二烯体的芳族化合物的合成提供了一种潜在的有利的路线通过初步形成双环[2.2.2]辛烯酮类化合物，可以进一步在氧化条件下芳香5。通过采用分子内的热脱氢DA苯乙烯二烯与炔反应，利用苯乙烯作为二烯，如不需要的[2 +2]环加成5,6和聚合反应7和区域选择性差，减轻和萘化合物的问题通常与可以生成。 苯乙烯与炔烃分子内的热脱氢DA反应也不是没有相当大的问题。首先，大多数反应受到产量低，长的反应时间，和高的反应温度8-11。此外，很多反应不提倡纯形成的萘产品，萘和二氢生产，往往分不开的混合物通过柱层析11,12。的前体的苯乙烯 - ynes系绳也仅限于包括的杂原子和/或羰基部分。仅是一个示例报告所有含碳的系绳，要求的条件为250℃下48小时整洁，以便取得萘生成10。 除了有限的各种内的系绳的起始原料，这种方法的最严重的限制之一是在常规的热条件下的耐受性的功能的缺乏。的炔末端的原料或者是未取代的或附加的苯基或三甲基甲硅烷基（TMS）基团8-13。 在一个实例中，示出在炔烃末端酯进行脱氢的DA反应，但这个结果萘，二氢萘产品11的混合物中。后来的提案建议，TMS组附加炔末端是必要的，实现独家萘形成的高收益率10。 热脱氢DA反应报告的各种功能的不足，严重限制了潜在的这种反应对装配独特的萘结构。 萘结构的变化源于它们的功能，在多个科学领域，特别是有机荧光染料14,15的小分子构建模块的愿望。出色的空间分辨率和响应时间的小组织ANIC染料监测实时事件16已经导致数百市售的荧光化合物的发展。许多这些染料是萘与分立的光物理和化学性质15。 选择的荧光染料具有特殊性能的监视单个的功能，从而导致不​​断增长的需求提供更多样化的光物理性质的荧光基团为新的类是具有挑战性的。为此目的，热分子内脱氢DA反应的苯乙烯与炔烃，允许多样化的一个独特的萘骨架将是潜在的有利开发新的萘的含有荧光染料中的应用。 作为一种替代方法，常规加热，微波辅助化学是有利的，因为它提供的化学样品的更均匀的加热，从而导致更高的化学产率，更快的反应速率，温和的反应条件下s，而往往是不同的选择性的产品17。 采用微波辅助与传统加热条件下的反应时间从几天减少到几分钟，增加以前差收益，降低反应温度，并提供更多的选择性形成的分子内的苯乙烯脱氢DA反应，消除的方法与此相关的问题所需的富马酸二甲酯产物。微波辅助的反应条件下，也可能会更容易，更多样化的功能，以方便将进入富马酸二甲酯的产品，这是前所未有的。只有一个现有的例子已被报道利用脱氢DA的反应，其中的90％产率的富马酸二甲酯和二氢化萘中得到尽可能少为15分钟，在170°C 12的微波辅助的条件。 在这里报道了微波辅助分子内脱氢酶本地DA反应的苯乙烯基衍生工具的专属形成的官能化和多样化的富马酸二甲酯的产品，在短短的30分钟，高定量的产率18。此协议进一步证明该实用程序的萘产品的一个步骤转换成一种新型的溶致变色荧光染料的光物理性质的对手流行的商用染料普罗丹19。

<table border="1">
	<tbody>
		<tr>
			<td>Reagent/Material</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>1,2-Dichloroethane, ACS reagent &ge;99.0%</td>
			<td>Sigma-Aldrich</td>
			<td>319929</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>SiliaPlate G TLC - glass-backed, 250 &mu;m</td>
			<td>Silicycle</td>
			<td>TLG-R10011B-323</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Ethyl acetate, certified ACS &ge;99.5%</td>
			<td>Fisher Scientific</td>
			<td>E14520</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Hexanes, certified ACS &ge;98.5%</td>
			<td>Fisher Scientific</td>
			<td>H29220</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Silica gel, standard grade</td>
			<td>Sorbent Technologies</td>
			<td>30930M</td>
			<td>60 A, 40-63 &mu;M (230 x 400 mesh)</td>
		</tr>
		<tr>
			<td>RuPhos palladacycle</td>
			<td>Strem</td>
			<td>46-0266</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Nitrogen gas</td>
			<td>Matheson TRIGAS</td>
			<td>NI304</td>
			<td>Nitrogen 304cf, industrial</td>
		</tr>
		<tr>
			<td>Lithium bis(trimethylsilyl) amide solution</td>
			<td>Sigma-Aldrich</td>
			<td>225770</td>
			<td>1.0 M solution in THF</td>
		</tr>
		<tr>
			<td>Tetrahydrofuran anhydrous &ge;99.9%</td>
			<td>Sigma-Aldrich</td>
			<td>401757</td>
			<td>Inhibitor-free</td>
		</tr>
		<tr>
			<td>Dimethylamine solution</td>
			<td>Sigma-Aldrich</td>
			<td>391956</td>
			<td>2.0 M solution in THF</td>
		</tr>
		<tr>
			<td>Ammonium chloride</td>
			<td>Fisher Scientific</td>
			<td>A661-500</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Sodium sulfate, anhydrous (granular)</td>
			<td>Fisher Scientific</td>
			<td>S421-500</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Chromatography column</td>
			<td>Chemglass</td>
			<td>CG-1188-04</td>
			<td>&frac12; in ID x 18in E.L.</td>
		</tr>
		<tr>
			<td>Cyclohexane, &ge;99.0%</td>
			<td>Fisher Scientific</td>
			<td>C556-1</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Toluene anhydrous, 99.8%</td>
			<td>Sigma-Aldrich</td>
			<td>24451</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>1,4-Dioxane anhydrous, 99.8%</td>
			<td>Sigma-Aldrich</td>
			<td>296309</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Tetrahydrofuran anhydrous, &ge;99.9%</td>
			<td>Sigma-Aldrich</td>
			<td>186562</td>
			<td>250 ppm BHT as inhibitor</td>
		</tr>
		<tr>
			<td>Dichloromethane</td>
			<td>Sigma-Aldrich</td>
			<td>650463</td>
			<td>Chromasolv Plus</td>
		</tr>
		<tr>
			<td>Chloroform, &ge;99.8%</td>
			<td>Fisher Scientific</td>
			<td>C298-1</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Acetonitrile anhydrous, 99.8%</td>
			<td>Sigma-Aldrich</td>
			<td>271004</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Dimethyl sulfoxide, &ge;99.9%</td>
			<td>Fisher Scientific</td>
			<td>D128</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Ethyl alcohol</td>
			<td>Pharmco-AAPER</td>
			<td>11ACS200</td>
			<td>Absolute</td>
		</tr>
		<tr>
			<td>Equipment</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Microwave Synthesizer</td>
			<td>Biotage</td>
			<td>Biotage Initiator Exp</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Microwave Vial</td>
			<td>Biotage</td>
			<td>352016</td>
			<td>0.5 - 2 ml</td>
		</tr>
		<tr>
			<td>Microwave Vial</td>
			<td>Biotage</td>
			<td>351521</td>
			<td>2 - 5 ml</td>
		</tr>
		<tr>
			<td>Microwave Vial Cap</td>
			<td>Biotage</td>
			<td>352298</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Microwave Synthesizer</td>
			<td>Anton Paar</td>
			<td>Monowave 300</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Microwave Vial G4</td>
			<td>Anton Paar</td>
			<td>99135</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Microwave Vial Cap</td>
			<td>Anton Paar</td>
			<td>88882</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>NMR Spectrometer</td>
			<td>Bruker</td>
			<td>Avance</td>
			<td>300 or 400 MHz</td>
		</tr>
		<tr>
			<td>UV-Visible Spectrometer</td>
			<td>PerkinElmer</td>
			<td>Lamda 9</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Spectrophotometer cell</td>
			<td>Starna Cells</td>
			<td>29B-Q-10</td>
			<td>Spectrosil quartz, path length 10 mm, semi-micro, black wall</td>
		</tr>
		<tr>
			<td>Spectrofluorometer</td>
			<td>HORIBA Jobin Yvon</td>
			<td>FluoroMax-3 S4</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Fluorometer cell</td>
			<td>Starna Cells</td>
			<td>29F-Q-10</td>
			<td>Spectrosil quartz, path length 10 mm, semi-micro</td>
		</tr>
	</tbody>
</table>

microwave-assisted intramolecular dehydrogenative diels-alder reactions for the synthesis of functionalized naphthalenes/solvatochromic dyes

功能化萘的应用程序在不同的研究领域，从天然或生物活性分子的合成新型有机染料的制备。虽然众多的策略已被报告给访问萘棚架，许多程序在结合功能，这反过来又变窄的范围内可用的基板方面仍然存在局限性。因此，通用的方法直接访问取代的萘的发展是非常必要的。 的Diels-Alder（DA）的环加成反应是一个强大的和有吸引力的方法，从容易得到的起始原料，形成饱和的和不饱和的环系统。本文描述一种新的微波辅助分子内脱氢DA反应的苯乙烯基衍生物生成多种官能化的环戊二烯并[b]萘，无法使用现有的合成方法来制备第当比常规加热，微波辐射加速反应速率，提高产量，并限制了不希望的副产物的形成。 此协议的实用程序进一步证明由转换的DA环加成到一种新型的溶致变色荧光染料经由布赫瓦尔德-哈特威格钯催化的交叉偶联反应。荧光光谱法，作为一个信息和灵敏的分析技术，研究领域包括环境科学，医学，药理学，细胞生物学中起着关键的作用。获得各种新的有机荧光团所提供的微波辅助的脱氢DA反应允许在这些领域的进一步提高。

照射微波（MWI）的苯乙烯基衍生物，在180℃结果完全环戊二烯并[b]萘形成在低至30分钟，并在高至定量的产率（ 图1）18。 无二氢萘副产品是观察，并通过1 H NMR光谱的产品，而不需要额外的纯化照射后（ 图2）出现纯。耐受性良好的富马酸二甲酯框架的各种变化利用这些热的条件下，包括该系绳的变化和替代图案的萘环，吸电子基团的一个?...

Watch this Scientific Journal Video about Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes at JoVE.com

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

微波辅助分子内的脱氢的Diels-Alder反应（DA）提供简洁的访问功能化环戊[<em&gt; B</em&gt;]萘积木。一个步骤转换成脱氢DA双环[2.2.2]辛烯酮类化合物的新型溶致变色荧光染料通过布赫瓦尔德-哈特维希钯催化交叉偶联反应证明了这种方法的效用。

微波辅助分子内Diels-Alder反应的功能化萘/变色染料的合成脱氢

Functionalized naphthalenes have applications in a variety of research fields ranging from the synthesis of natural or biologically active molecules to ...

Research

Education

JoVE Core

JoVE Journal

Organic Chemistry

Chemistry

Unit 1

Dienes, Conjugated Pi Systems, and Pericyclic Reactions

SCIENTISTS IN ACTION

Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

保利的微波辅助功能化（乙二醇）和On-树脂链聚合反应，并形成水凝胶的肽使用

One of the main benefits to using poly(ethylene glycol) (PEG) macromers in hydrogel formation is synthetic versatility. The ability to draw from a large ...

科研

化学

Preparation of Silica Nanoparticles Through Microwave-assisted Acid-catalysis

Microwave-assisted synthetic techniques were used to quickly and reproducibly produce silica nanoparticle sols using an acid catalyst with nanoparticle ...

Synthesis and Characterization of Functionalized Metal-organic Frameworks

功能化的合成与表征金属 - 有机骨架

Metal-organic frameworks have attracted extraordinary amounts of research attention, as they are attractive candidates for numerous industrial and ...

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

热可逆交联橡胶通过的Diels-Alder反应的化学制备与性能

A method for using Diels Alder thermo-reversible chemistry as cross-linking tool for rubber products is demonstrated. In this work, a commercial ...

Synthesis of Plant Phenol-derived Polymeric Dyes for Direct or Mordant-based Hair Dyeing

对于直接或媒介为基础的头发染色厂苯酚衍生的高分子染料的合成

Effective hair dyeing through in situ incubation of keratin hair with the products of fungal laccase-catalyzed polymerization of plant phenols has been ...

One-pot Microwave-assisted Conversion of Anomeric Nitrate-esters to Trichloroacetimidates

硝酸酯 Anomeric Trichloroacetimidates 的单锅微波辅助转化

The goal of the following procedure is to provide a demonstration of the one-pot conversion of a 2-azido-1-nitrate-ester to a trichloroacetimidate ...

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

酶联反应合成 l-赖氨酸手性氨基醇的研究

Amino alcohols are versatile compounds with a wide range of applications. For instance, they have been used as chiral scaffolds in organic synthesis. ...

Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization

低温微波辅助热液碳化降低柳树燃料排放

Biomass is a sustainable fuel, as its CO2 emissions are reintegrated in biomass growth. However, the inorganic precursors in the biomass cause a negative ...

Pretargeted Radioimmunotherapy Based on the Inverse Electron Demand Diels-Alder Reaction

基于逆电子需求函数-alder 反应的隐形放射免疫治疗

While radioimmunotherapy (RIT) is a promising approach for the treatment of cancer, the long pharmacokinetic half-life of radiolabeled antibodies can ...

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

功能化单有机硼化合物共轭法高效合成全碳第四纪中心

The conjugate addition of organometallic reagents to &#945;,&#946;-unsaturated carbonyls represents an important method to generate C&#8211;C bonds in the ...