Catalytic Asymmetric [2,3]-Sigmatropic Rearrangement of Sulfur Ylides Generated from Copper(I) Carbenoids and Allyl Sulfides
作者:Xiaomei Zhang、Zhaohui Qu、Zhihua Ma、Weifeng Shi、Xianglin Jin、Jianbo Wang
DOI:10.1021/jo025687f
日期:2002.8.1
Catalytic asymmetric sulfur ylide [2,3]-sigmatropicrearrangement of carbenoids generated from aryldiazoacetates has been investigated with a number of chiral Rh(II) and Cu(I) catalysts, and moderately high enantioselectivity (52-78% ee) can be achieved with Cu(MeCN)(4)PF(6)/2,2'-isopropylidenebis[(4S)-4-tert-butyl-2-oxazoline].
Allylation of arenethiols by allylic alcohol with sterically hindered carbon of the allylic moiety is smoothly catalyzed by Pd(OAc)2/TPPTS in biphasic water/hexane media under ambient conditions. The catalyst water layer can be repeatedly reused without catalytic activity loss.
A facile and general method for palladium-catalyzedstereoselective bisthiolation of terminalalkynes with allyl phenyl sulfides has been developed. The scope and versatility of the reaction have been demonstrated, and a broad range of substrates bearing electron-donating and -withdrawing groups on the aromatic rings were all compatible with this reaction, providing the desired (Z)-1,2-dithio-1-alkenes
已经开发了一种用于钯催化的末端炔烃与烯丙基苯硫醚的立体选择性双硫醇化的简便通用方法。该反应的范围和多功能性已经得到证明,并且在芳环上带有给电子和吸电子基团的广泛底物都与该反应相容,提供了所需的 ( Z )-1,2-dithio-1 -烯烃的产率适中至良好。初步机理研究表明,所需产物的硫源可以通过两分子烯丙基苯基硫醚的C-S键断裂依次掺入炔烃中,排除了乙烯基硫醚、炔基硫醚和二硫化物中间体参与其中的可能性。反应。
Rh-Catalyzed [2,3]-Sigmatropic Rearrangement of Alkynyl Carbenes with Allyl Sulfides to Access Sulfide-Substituted 1,5-Enynes
作者:Zhongxue Fang、Yu Wang、Yiming Ma、Xinyue Han、Zhaohong Liu、Yongquan Ning
DOI:10.1021/acs.joc.2c02910
日期:2023.7.21
describes the development of Rh-catalyzed [2,3]-sigmatropicrearrangement of alkynyl carbenes with allyl sulfides. The protocol exhibits equitable functional group tolerance and allows the formation of a variety of synthetically valuable sulfide-substituted 1,5-enyne products. To the best of our knowledge, this is the first example of [2,3]-sigmatropicrearrangement of alkynyl carbenes. DFT analysis supports