Isomerization of Aziridines to Allyl Amines via Titanium and Chromium Cooperative Catalysis
作者:Chengbo Yao、Alana D. N. Williams、Yiting Gu、Jack R. Norton
DOI:10.1021/acs.joc.1c03054
日期:2022.4.1
cooperative catalyst isomerizes aziridines to allyl amines under mild conditions. The reaction tolerates a broad range of aziridines with various nitrogen substituents. The titanium catalyst is most successful in opening 1,2-disubstituted aziridines, forming radical intermediates in a highly regioselective manner. The chromium catalyst appears to abstract an H• from these radical intermediates and
DAST-mediated ring-opening of cyclopropyl silyl ethers in nitriles: facile synthesis of allylic amides <i>via</i> a Ritter-type process
作者:Masayuki Kirihara、Riho Nakamura、Kana Nakakura、Kazuki Tujimoto、Mohamed S. H. Salem、Takeyuki Suzuki、Shinobu Takizawa
DOI:10.1039/d2ob00940d
日期:——
A diethylaminosulfur trifluoride (DAST)-mediated ring-opening reaction of cyclopropyl silyl ethers in nitriles produced allylic amides in moderate to good yields (up to 87%). Time course studies using ReactIR and O-isotopic labeling mechanistic studies suggested that the present reaction occurs via a Ritter-type process, leading to the formation of allylic amides.
二乙氨基三氟化硫 (DAST) 介导的环丙基甲硅烷基醚在腈中的开环反应以中等至良好的产率(高达 87%)产生烯丙基酰胺。使用 ReactIR 和 O 同位素标记机理研究的时间过程研究表明,本反应通过Ritter 型过程发生,导致烯丙基酰胺的形成。