在
三氯化铁 作用下,
以
异丙醇 为溶剂,
反应 2.0h,
以99%的产率得到(2S,3R,4S)-4-[(2S,5R,7R,8R,9S)-7-(carboxymethyl)-2-[(2R,5S)-5-ethyl-5-[(2R,3S,5R)-5-[(2S,3S,5R,6R)-6-hydroxy-6-(hydroxymethyl)-3,5-dimethyloxan-2-yl]-3-methyloxolan-2-yl]oxolan-2-yl]-2,8-dimethyl-1,10-dioxaspiro[4.5]decan-9-yl]-3-methoxy-2-methylpentanoic acid