(-)-(1S)-menthyl 5-exo,6-exo-(isopropylidenedioxy)-3-endo-(2-pyridylsulphonyl)bicyclo<2.2.1>heptane-2-endo-carboxylate 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以
二甲基亚砜 为溶剂,
反应 3.0h,
以26%的产率得到(1S,2R,6S,7S,8S,9R)-4,4-Dimethyl-9-(pyridine-2-sulfonyl)-3,5-dioxa-tricyclo[5.2.1.02,6]decane-8-carboxylic acid (1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl ester