反式-2-丁烯酸乙酯 在
camphor-10-sulfonic acid 、
potassium tert-butylate 作用下,
以
叔丁醇 为溶剂,
反应 2.5h,
生成
[(1R,2S,5R)-5-methyl-2-propan-2-ylcyclohexyl] (1R,6S)-6-methyl-2-oxo-4-propan-2-yloxycyclohex-3-ene-1-carboxylate 、 [(1R,2S,5R)-5-methyl-2-propan-2-ylcyclohexyl] (1R,6S)-6-methyl-4-oxo-2-propan-2-yloxycyclohex-2-ene-1-carboxylate