Synthesis of Chiral cis-1,2,3-Trisubstituted Aziridines
摘要:
Chiral cis-1,2,3-trisubstituted aziridines were conveniently synthesized from (1R,2S)-(-)- or (1S,2R)-(+)-norephedrine via the corresponding chiral N-(arylidene)-beta-chloroamines. The enantiomeric purity of the chiral aziridines (e.e. >98%) was established by NMR spectroscopy utilizing (S)-(+)-1-(9-anthryl)-2,2,2-trifluoroethanol. (C) 2000 Elsevier Science Ltd. All rights reserved.
Reduction of α-phenylselanyl imines derived from β-phenylselanyl α-oxoesters or PhSeCl assisted nucleophilic addition of primary amines to α,β-unsaturated esters have led to β-alkylamino phenylselenides 4, 5, 12 and 13 which were cyclised into aziridines 8, 9 and 14 after selenium activation. threo-Amino selenides led stereospecifically to cis-2,3-disubstituted aziridines. Depending on the structure