Cobalt-Catalyzed Allylation of Amides with Styrenes Using DMSO as Both the Solvent and the α-Methylene Source
作者:Xu Zhang、Zhi Zhou、Huiying Xu、Xuefeng Xu、Xiyong Yu、Wei Yi
DOI:10.1021/acs.orglett.9b02462
日期:2019.9.20
An efficient synthesis of privileged allylic amines has been developed via cobalt-catalyzed allylation of amides with styrenes, in which DMSO was used as both the solvent and the α-methylene source. This transformation features high yields, and selectivity for the (E)-isomer of the linear product. Through the experimental and computational investigations, a sequential K2S2O8-mediated oxidative cou
通过将酰胺与苯乙烯进行钴催化的烯丙基化反应,已经开发了一种有效的特权烯丙基胺的合成方法,其中DMSO既用作溶剂,又用作α-亚甲基源。该转化具有高收率和对线性产物的(E)-异构体的选择性。通过实验和计算研究,还推导了顺序的K 2 S 2 O 8介导的氧化偶联/钴辅助的区域选择性烯烃插入/β-H消除/烯烃解离/氢化物转移过程。
Novel synthetic method for N-allylcarbamates from allyl ethers using chlorosulfonyl isocyanate
Various allyl ethers were converted into the corresponding N-allylcarbamates usingchlorosulfonylisocyanate (CSI) via the stable allylic carbocation rather than β-lactam through [2+2] cycloaddition. The reaction of cinnamyl methyl ether with CSI afforded only methyl N-cinnamylcarbamate at 0°C, but at 20°C, it produced a mixture of methyl N-cinnamylcarbamate and methyl N-(1-phenylprop-2-enyl)carbamate
Hydroxy Chalcogenide-Promoted Morita-Baylis-Hillman Alkylation Reaction: Intermolecular Applications with Alkyl Halides as Electrophiles
作者:Ana Gradillas、Efres Belmonte、Rondes Ferreira da Silva、Javier Pérez-Castells
DOI:10.1002/ejoc.201301743
日期:2014.3
Hydroxysulfides acted as catalysts to promote the Morita–Baylis–Hillmanalkylationreaction of cyclohexenones and dihydropyridinones. The procedure worked efficiently with a variety of halides as electrophiles. Side reactions were in competition with the MBH alkylation, but fine-tuning the reaction conditions minimized their occurence.