(E,2S,4R,9R)-4-[tert-butyl(dimethyl)silyl]oxy-1-[(2R,3S)-2,3-dimethyl-3,4-dihydro-2H-pyran-6-yl]-7,9-dimethyl-10-phenylmethoxydec-6-en-2-ol 在
camphor-10-sulfonic acid 作用下,
以
甲醇 为溶剂,
生成 (2S,4S,6S,8R,9S)-2-<(5R)-(2E)-6-Benzyloxy-3,5-dimethyl-2-hexen-1-yl>-8,9-dimethyl-4-hydroxy-1,7-dioxaspiro<5.5>undecane