rac-16,16-ethane-1,2-diyldioxy-1α,6α-dimethoxy-4-methoxymethyl-21-methyl-7α,20α-cyclo-17-nor-atidane-13,19-dione 在
sodium tetrahydroborate 作用下,
以
甲醇 为溶剂,
生成
rac-16,16-ethane-1,2-diyldioxy-13β-hydroxy-1α,6α-dimethoxy-4-methoxymethyl-21-methyl-7α,20α-cyclo-17-nor-atidan-19-one