(3RS,4aR,6aS,7R,9aR,9bS)-toluene-4-sulfonic acid 9a-hydroxy-3-methoxy-6a-methyldodecahydrocyclopenta[h]isochromen-7-yl ester 在
sodium hydride 作用下,
以
二甲基亚砜 为溶剂,
生成 (3R,4aR,11aS)-3-methoxy-7-methyl-3,4,4a,5,6,9,10,11a-octahydro-1H-cyclonona[c]pyran-11-one 、
(3S,4aR,11aS)-3-methoxy-7-methyl-3,4,4a,5,6,9,10,11a-octahydro-1H-cyclonona[c]pyran-11-one