描述了不同的[ N-(芳烃磺酰基)亚氨基]苯基碘丁酮的制备,以及对它们作为用于铜催化的不同烯烃的氮烯前体的效用的评价。使用p -NO 2 -C 6 H 4 SO 2 N = IPh和p -MeO-C 6 H 4 SO 2 N = IPh获得了最佳结果,这两个结果均优于以前被认为是PhI = NTs的情况。这类反应的选择试剂。使用1.0当量的烯烃和1.5当量的腈前体,可以以良好至极好的收率(60-99%)获得相应的氮丙啶衍生物。
Amide/Iminium Zwitterionic Catalysts for (Trans)esterification: Application in Biodiesel Synthesis
作者:Ying-Pong Lam、Xinyan Wang、Fei Tan、Wing-Hin Ng、Ying-Lung Steve Tse、Ying-Yeung Yeung
DOI:10.1021/acscatal.9b01959
日期:2019.9.6
organocatalysts based on an amide anion/iminium cation charge pair has been developed. The zwitterions are easily prepared by reacting aziridines with aminopyridines. They are catalytically applicable to transesterifications and dehydrative esterifications. Mechanistic studies reveal that the amide anion and iminium cation work synergistically in activating the reaction partners, with the iminium cationic
A method for rhodium(II)-catalyzed aziridination of olefins
作者:Paul Müller、Corine Baud、Yvan Jacquier
DOI:10.1016/0040-4020(95)00999-x
日期:1996.1
decomposition of (N-(p-nitrobenzenesulfonyl)imino)phenyliodinane (PhINNs) in the presence of olefins affords aziridines in yields of 18–85%. The aziridination of cis-β- methylstyrene (1h) and cis-hex-2-ene (1k) is stereospecific. However, with cis-stilbene (1m) a ca. 3:1 mixture of cis- and trans aziridines 2m and 21 is obtained. With chiral catalysts asymmetric inductions in up to 73% ee are obtained
in formal insertions into CHbonds, activated by phenyl or vinyl groups, or by O-substituents. Scope and limitations of the reaction were investigated. Yields of up to 84% were achieved in the most favorable cases. Yields were enhanced by electron-releasing substituents and decreased by steric hindrance. Aziridination competed with allylic insertion with olefinic substrates. The insertion reaction proceeded
As an approach to the enantioselective synthesis of trans-decahydroquinolines (DHQs), desymmetrization of meso-aziridine (5) with various carbon nucleophiles under catalytic conditions was investigated. By applying TMSCN in the presence of YbCl3 and chiral non-racemic ligands, nitrile 13 was obtained with an ee up to 40%. Nitrile 13 was a key intermediate in a novel route to trans-DHQs.
Generation and Ring Opening of Aziridines in Telescoped Continuous Flow Processes
作者:Nathanael Hsueh、Guy J. Clarkson、Michael Shipman
DOI:10.1021/acs.orglett.5b01777
日期:2015.7.17
A simple method for the preparation of a variety of N-sulfonyl aziridines (10 examples) from 1,2-amino alcohols under continuous flow conditions is described. Using flow based methods, the aziridines can be further ring opened with oxygen, carbon, and halide nucleophiles or ring expanded to imidazolines by Lewis acid promoted reaction with nitriles. Telescoping the aziridine generation and ring opening steps together in a microfluidic reactor allows the chemistry to be undertaken with limited exposure to the potentially hazardous aziridine intermediates.