Scope and limitations of diastereoselective aziridination reactions using stabilised ammonium ylides or α-bromo carbonyl nucleophiles
作者:Stefan Aichhorn、Guddeangadi N. Gururaja、Michael Reisinger、Mario Waser
DOI:10.1039/c3ra40429c
日期:——
The applicability of easily available ammonium salts to access aziridines via an ammonium ylide pathway was carefully investigated and compared with classical aza-Darzens approaches using α-bromo carbonyl nucleophiles. Whereas amide-stabilised ammonium ylides could be successfully reacted with aromatic aldimines to obtain the corresponding trans-aziridines in good yields and with high diastereoselectivities, α-bromo amides failed. In sharp contrast, acetophenone-based ylides did not give any aziridines while in this specific case α-bromo acetophenone derivatives gave the corresponding cis-aziridines in high yields and with excellent diastereoselectivities under optimised conditions.
Synthesis of 2-Benzoyl-3-aryl-N-arylsulphonylaziridines from the Reaction of N-Arylsulphonylimines with Dimethylsulphonium Phenacylide - The First Example of A Functionalized-Methylene Transfer to Azomethines
作者:Upender K. Nadir、Anjali Arora
DOI:10.1080/00397919608004547
日期:1996.6
Abstract The first example of phenacyl group transfer from dimethylsulphonium phenacylide to N-arylsulphonylimines to yield 2-benzoyl-1-arylsulphonylaziridines is described.
3-Substituted 2-Acyl-1-sulfonylaziridines from the Reaction of Triphenylbismuthonium 2-Oxoalkylides and N-Sulfonylaldimines. Reversal of the cis/trans-Isomer Ratios Depending on Base and Additive
has been accomplished in the presence of a chiral N,N′‐dioxide/[Sc(OTf)3] complex (0.5–2 mol %), delivering the desired vicinal anti‐α‐iodo‐β‐amino carbonyl compounds regioselectively in high yields (up to 97 %) and with excellent diastereoselectivities (>99:1 d.r.) and enantioselectivities (up to 99 % ee). Enantiopure syn‐α‐iodo‐β‐amino products could also be obtained from the isomerization of particular