环戊二烯 、
(E)-6-(tert-Butyl-dimethyl-silanyloxy)-1-cyclohexyl-1-(4-methoxy-benzyloxy)-hex-3-ene-2,5-dione 在
三氟化硼乙醚 作用下,
以
二氯甲烷 为溶剂,
生成 (R)-1-{(1S,2R,3R,4R)-3-[2-(tert-Butyl-dimethyl-silanyloxy)-acetyl]-bicyclo[2.2.1]hept-5-en-2-yl}-2-cyclohexyl-2-hydroxy-ethanone 、 (R)-1-{(1S,2R,3R,4R)-3-[2-(tert-Butyl-dimethyl-silanyloxy)-acetyl]-bicyclo[2.2.1]hept-5-en-2-yl}-2-cyclohexyl-2-(4-methoxy-benzyloxy)-ethanone 、 (S)-1-{(1S,2R,3R,4R)-3-[2-(tert-Butyl-dimethyl-silanyloxy)-acetyl]-bicyclo[2.2.1]hept-5-en-2-yl}-2-cyclohexyl-2-(4-methoxy-benzyloxy)-ethanone 、 (S)-1-{(1R,2R,3R,4S)-3-[2-(tert-Butyl-dimethyl-silanyloxy)-acetyl]-bicyclo[2.2.1]hept-5-en-2-yl}-2-cyclohexyl-2-(4-methoxy-benzyloxy)-ethanone