(3R,5S)-benzyl-2-acetoxy-5-methyl-3-(pivaloyloxy)piperidine-1-carboxylate 、
ethyl 3-trimethylsiloxycinnamate 在
scandium tris(trifluoromethanesulfonate) 作用下,
以
二氯甲烷 为溶剂,
以100%的产率得到(+)-(2S,3R,5S)-benzyl-2-(1-(ethoxycarbonyl)-2-oxo-2-phenylethyl)-5-methyl-3-(pivaloyloxy)piperidine-1-carboxylate