Direct synthesis of dialkylarylvinylsilane derivatives: metathesis of dialkylaryl-iso-propenylsilane and its application to tetracyclic silacycle dye synthesis
The metathesis of dialkylarylvinylsilane, which has not been accomplished to date, is achieved using dialkylaryl-iso-propenylsilane as a substrate. In addition, we discovered that the reason why the metathesis of a ruthenium carbene complex and dialkylarylvinylsilane is difficult is the formation of a carbide complex.
Direct Intramolecular Conjugate Addition of Simple Alkenes to α,β-Unsaturated Carbonyls Catalyzed by Cu(OTf)<sub>2</sub>
作者:Yan Qin、Jian Lv、Sanzhong Luo、Jin-Pei Cheng
DOI:10.1021/ol502373u
日期:2014.10.3
An unprecedented intramolecular conjugate addition of simple alkenes to α,β-unsaturated carbonyl compounds has been developed. A simple Lewis acid such as Cu(OTf)2 was found to effectively catalyze the reaction, and six- and five-membered cyclic products were obtained in moderate to high yields.
Intramolecular Crossed [2+2] Photocycloaddition through Visible Light-Induced Energy Transfer
作者:Jiannan Zhao、Jonathan L. Brosmer、Qingxuan Tang、Zhongyue Yang、K. N. Houk、Paula L. Diaconescu、Ohyun Kwon
DOI:10.1021/jacs.7b05277
日期:2017.7.26
Herein, we present the intramolecular [2+2] cycloadditions of dienones promoted through sensitization, using a polypyridyl iridium(III) catalyst, to form bridged cyclobutanes. In contrast to previous examples of straight [2+2] cycloadditions, these efficient crossed additions were achieved under irradiation with visible light. The reactions delivered desired bridged benzobicycloheptanone products with
Synthesis of Phthalans Via Copper-Catalyzed Enantioselective Cyclization/Carboetherification of 2-Vinylbenzyl Alcohols
作者:Dake Chen、Sherry R. Chemler
DOI:10.1021/acs.orglett.8b02766
日期:2018.10.19
Enantiomerically enriched phthalans were synthesized efficiently via an enantioselective copper-catalyzed alkene carboetherification reaction. In this reaction, 2-vinylbenzyl alcohols enantioselectively cyclize then couple with vinylarenes. The utility of the method was demonstrated by the enantioselective synthesis of ( R)-fluspidine, a σ1 receptor ligand.
Sequential Addition of Amines to Nitrile and Carbon–Carbon Multiple Bond: A Route to 7-Amino-5<i>H</i>-dibenzo[<i>c,e</i>]azepines
作者:Kun Hu、Ruiting Liu、Xigeng Zhou
DOI:10.1021/acs.orglett.1c02540
日期:2021.9.3
intramolecular C–N bond formation of 2-nitrile-2′-alkenyl(alkynyl)biphenyls with amines has been developed, which provides a straightforward and efficient access to a range of new functional dibenzo[c,e]azepines. This represents the first examples of direct construction of seven-membered azaheterocycle from unsaturated nitriles and amines. Such transformations have the advantages of avoiding the use of additives
已经开发了一种稀土金属催化的 2-腈-2'-烯基(炔基)联苯与胺的分子间和分子内连续 C-N 键形成,这为获得一系列新的功能性二苯并提供了一种直接有效的途径。c , e ]氮杂。这代表了从不饱和腈和胺直接构建七元氮杂杂环的第一个例子。这种转化具有避免使用添加剂、原料易得、分步经济和高原子经济性、反应条件温和、选择性高的优点。