ethyl (2E,4R,5R)-5-tert-butyldimethylsilyloxy-4-trichloroacetimidoyloxyhex-2-enoate 在
potassium tert-butylate 作用下,
以
四氢呋喃 为溶剂,
生成 (4R,5R)-5-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-trichloromethyl-4,5-dihydro-oxazole-4-carboxylic acid ethyl ester 、 (4S,5R)-5-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-trichloromethyl-4,5-dihydro-oxazole-4-carboxylic acid ethyl ester