Gold-catalyzed (4+3)-annulations of 2-alkenyl-1-alkynylbenzenes with anthranils with alkyne-dependent chemoselectivity: skeletal rearrangement <i>versus</i> non-rearrangement
作者:RahulKumar Rajmani Singh、Manisha Skaria、Liang-Yu Chen、Mu-Jeng Cheng、Rai-Shung Liu
DOI:10.1039/c8sc03619e
日期:——
Two distinct (4+3)-nitroxy annulations between 1,5-enynes and anthranils have been developed to access tetrahydro-1H-benzo[b]azepine derivatives; the chemoselectivity varies with the types of alkynes. Terminal alkyne substrates deliver benzo[b]azepine derivatives via a novel skeletal rearrangement while internal 1,5-enynes afford products without a rearrangement process. To elucidate the mechanism
已经开发了 1,5-烯炔和蒽醌之间的两种不同的 (4+3)-硝氧基环化来获得四氢-1 H-苯并[ b ] 氮杂卓衍生物;化学选择性因炔烃的类型而异。末端炔烃底物通过新的骨架重排提供苯并[ b ]氮杂衍生物,而内部 1,5-烯炔提供无需重排过程的产物。为了阐明重排的机制,我们进行了13 C-和2 H-标记实验来鉴定含金的异苯并富烯中间体,但它们的形成依赖于邻氨基苯甲酸的存在。
Silver-Catalyzed Stereoselective [3+2] Cycloadditions of Cyclopropyl-Indanimines with Carbonyl Compounds
作者:Hsiao-Hua Hung、Yi-Ching Liao、Rai-Shung Liu
DOI:10.1002/adsc.201300090
日期:2013.5.17
Silver‐catalyzed stereoselective [3+2] cycloadditions between mono‐substituted cyclopropyl‐indanimines and aldehydes are reported. The stereochemical course of the reaction is rationalized with a cyclic transition state. The resulting indanimine cycloadducts are not readily hydrolyzed unless external aldehydes are present with the silver catalyst. Notably, this hydrolysis process leads to a change
Gold-Catalyzed Cyclization/Oxidative [3+2] Cycloadditions of 1,5-Enynes with Nitrosobenzenes without Additional Oxidants
作者:Chun-Hao Chen、Yen-Ching Tsai、Rai-Shung Liu
DOI:10.1002/anie.201209850
日期:2013.4.22
Golden control: The title reaction (see scheme) proceeds with high stereocontrol to generate the heterocyclic products in good yield. Experiments to probe the mechanism were performed.