(1R,2R)-1-[(2S,3S,6R,2'S,3'S,6'R)-6'-((1R,2R)-1,5-Dihydroxy-2,5-dimethyl-hexyl)-3,3'-dimethyl-octahydro-[2,2']bipyranyl-6-yl]-2,5-dimethyl-hexane-1,5-diol 在
camphor-10-sulfonic acid 作用下,
以
苯 为溶剂,
反应 3.0h,
以96%的产率得到(2R,3R,2'R,5'S,6'S,2''S,3''S,6''R,2'''R,3'''R)-3,6,6,5',3'',3''',6''',6'''-Octamethyl-hexadecahydro-[2,2';6',2'';6'',2''']quaterpyran