2-Ethyl-4-methoxymethoxy-5-methyl-benzoic acid 、 (2E,6E)-(R)-8-[(2R,4S,6R,9S)-4-(tert-Butyl-diphenyl-silanyloxy)-8,9-dimethyl-1,7-dioxa-spiro[5.5]undec-2-yl]-4,6-dimethyl-octa-2,6-dienal 在
叔丁基锂 、 sodium hydride 作用下,
以
四氢呋喃 为溶剂,
生成 3-{(1E,5E)-(R)-7-[(2R,4S,6R,8R,9S)-4-(tert-Butyl-diphenyl-silanyloxy)-8,9-dimethyl-1,7-dioxa-spiro[5.5]undec-2-yl]-3,5-dimethyl-hepta-1,5-dienyl}-6-methoxymethoxy-4,7-dimethyl-isochroman-1-one 、 3-{(1E,5E)-(R)-7-[(2R,4S,6R,8S,9S)-4-(tert-Butyl-diphenyl-silanyloxy)-8,9-dimethyl-1,7-dioxa-spiro[5.5]undec-2-yl]-3,5-dimethyl-hepta-1,5-dienyl}-6-methoxymethoxy-4,7-dimethyl-isochroman-1-one