Dk. Wang et al., LEWIS-ACID PROMOTED AZIRIDINATION OF IMINES WITH SEMISTABILIZED SULFONIUM YLIDES - HIGHLY STEREOSELECTIVE SYNTHESIS OF VINYL-AZIRIDINES ANDETHYNYL-AZIRIDINES, Chemical communications, (13), 1997, pp. 1231-1232
cis-Vinyl- and cis-ethynyl-aziridines are furnished in high yields and
high stereoselectivity by aziridination of unactivated N-aryl or N-al
kyl imines with S-ylides in the presence of Lewis acids.