E. Dumez et al., Stereoselective synthesis of differentially protected anti-alpha,beta-diamino acid derivatives using arylthionitrooxiranes, SYNLETT, (8), 2001, pp. 1214-1216
Epoxidation of 1-tolylthio-1-nitroalkenes containing an allylic Z- or Fmoc-
protected amino group yields the corresponding, vn-epoxides which. although
they cannot be isolated. can be trapped with aqueous ammonia to give stere
oisomerically pure anti-alpha,beta -diamino acid derivatives.