2-(6-Bromo-3,4-dimethoxy-2-methyl-phenyl)-2-((S)-2-phenyl-propyl)-[1,3]dioxolane 在
lithium diisopropyl amide 作用下,
以
四氢呋喃 为溶剂,
生成 (1'S,2'S,10'S)-7',8'-dimethoxy-2',6'-dimethylspiro[1,3-dioxolane-2,4'-tetracyclo[8.2.2.11,5.09,15]pentadeca-5,7,9(15),11-tetraene] 、
(1'R,2'S,10'R)-7',8'-dimethoxy-2',6'-dimethylspiro[1,3-dioxolane-2,4'-tetracyclo[8.2.2.11,5.09,15]pentadeca-5,7,9(15),11-tetraene]