Amino acids;
Lewis acids;
Cyclization;
Diols;
CYCLIZATION;
HYDROAMINATION;
ALKYNE;
ESTERS;
D O I:
10.1002/ejoc.201100060
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
Lewis acid catalyzed cyclization of trichloroacetimidates derived from 1,4-butenediols and 1,5-butenediols was achieved to give 4-vinyl oxazolines and 4-vinyloxazines in good to excellent yields. The cyclization products were transformed to protected unsaturated alpha- and beta-amino acids, thus demonstrating the novel approach to access these important classes of compounds.