3-bromo-2-methoxy-5,6-dimethyl-4H-pyran-4-one 、
(1R,4aR,5S,6R,8aS)-5-allyl-5,8a-dimethyl-2-methylene-6-(triethylsilyloxy)decahydronaphthalen-1-carbaldehyde 在
正丁基锂 作用下,
以
四氢呋喃 、
正己烷 为溶剂,
反应 1.33h,
以86%的产率得到3-[(1R,4aR,5S,6R,8aS)-5-allyl-5,8a-dimethyl-2-methylene-6-(triethylsilyloxy)decahydronaphthalen-1-yl]hydroxymethyl-5,6-dimethyl-2-methoxy-4H-pyran-4-one