ethyl (2R,3R,4S)-1-(benzyloxycarbonyl)-3-methyl-4-hydroxy-2-pyrrolidinecarboxylate 、 ethyl (2S,3R,4S)-1-(benzyloxycarbonyl)-3-methyl-4-hydroxy-2-pyrrolidinecarboxylate 、 ethyl (2R,3R,4S)-1-(benzyloxycarbonyl)-3-hydroxy-4-methyl-2-pyrrolidinecarboxylate 、
对甲苯磺酰氯 生成
ethyl (2S,3R,4S)-1-(4-tolylsulfonyl)-3-methyl-4-hydroxy-2-pyrrolidinecarboxylate