Benzoic acid (1R,4R,4aS,4bS,8aS,9R,10aS)-9-acetoxy-4-methoxy-1,4a,7-trimethyl-6-oxo-1,3,4,4a,4b,5,6,9,10,10a-decahydro-2H-phenanthren-8a-ylmethyl ester 在
三甲基氯硅烷 、 sodium iodide 作用下,
以96%的产率得到Benzoic acid (1R,4R,4aS,4bS,8aS,9R,10aS)-9-acetoxy-4-hydroxy-1,4a,7-trimethyl-6-oxo-1,3,4,4a,4b,5,6,9,10,10a-decahydro-2H-phenanthren-8a-ylmethyl ester