重氮甲烷 、
(4S,4aR,10aR)-10a-((S)-Carboxy-hydroxy-methyl)-4a-hydroxy-6-methoxy-4-methyl-1,2,3,4,4a,9,10,10a-octahydro-phenanthrene-4-carboxylic acid 以
乙醚 、
丙酮 为溶剂,
以93%的产率得到(4S,4aR,10aR)-4a-Hydroxy-10a-((S)-hydroxy-methoxycarbonyl-methyl)-6-methoxy-4-methyl-1,2,3,4,4a,9,10,10a-octahydro-phenanthrene-4-carboxylic acid methyl ester