The ringopening of N-tosylaziridines with trimethylsilylated nucleophiles, catalyzed by N,N,N',N'-tetramethylethylenediamine, led to the production of beta-functionalized sulfonamides in good to excellent yields with high regioselectivity. [reaction: see text]
Large scale synthesis of optically pure aziridines
申请人:——
公开号:US20030153771A1
公开(公告)日:2003-08-14
Disclosed is an efficient, inexpensive method for the preparation of chiral aziridines on a large scale.
公开了一种高效、廉价的大规模制备手性环氧乙烷的方法。
Addition Reactions of Chloro- or Iodomethyllithium to Imines. Synthesis of Enantiopure Aziridines and β-Chloroamines
作者:José M. Concellón、Humberto Rodríguez-Solla、Pablo L. Bernad、Carmen Simal
DOI:10.1021/jo802596y
日期:2009.3.20
We report a novel, simple, and efficient synthesis of aziridines and 1-chloroalkan-2-amines by the reaction of imines derived from various aldehydes and p-toluenesulfonamide or benzenesulfonamide with iodoor chloromethyllithium, respectively. Both halogenated anions were generated in situ by treatment of diiodo- or chloroiodomethane with methyllithium at -78 or 0 degrees C. The reaction of in situ generated iodo- or chloromethyllithium could also be performed from chiral 2-aminoaldimines to yield enantiopure aziridines or (2S,3S)-2,3-diamino-1-chloroalkanes with high stereoselectivity.
Ring Opening and Expansion of Aziridines in a Silica−Water Reaction Medium
Ring-opening reactions of N-tosylaziridines with water-soluble nucleophiles proceeded in a silica−water reaction medium. The system is applicable to a ring expansion of an aziridine with potassium thiocyanate, leading to a thiazolidine derivative.
Addition Reactions of Iodomethyllithium to Imines. A Direct and Efficient Synthesis of Aziridines and Enantiopure Amino Aziridines
作者:José M. Concellón、Humberto Rodríguez-Solla、Carmen Simal
DOI:10.1021/ol801607r
日期:2008.10.16
synthesis of aziridines by the reaction of imines derived from p-toluenesulfonamides with in situ generated iodomethyllithium, with a simple and rapid experimental protocol, is reported for the first time. The reaction with the chiral aldimine derived from phenylalaninal allowed access to (2R,1'S)-2-(1'-aminoalkyl)aziridine with very high diastereoselectivity, in enantiopure form. A mechanism to explain