11β,21-dihydroxy-16α,17α-methylenedioxy-1,4-pregnadiene-3,20-dione 在
ice water sodium chloride 、 crude product 、 silica gel 、
二氯甲烷,丙烷-2-酮 作用下,
以
吡啶 、
丙酸酐 为溶剂,
反应 1.0h,
以thus obtaining 2.5 g of 11β-hydroxy-16α,17α-methylenedioxy-21-propionyloxy-1,4-pregnadiene-3,20-dione, mp 184°-185° C.的产率得到11beta-Hydroxy-16alpha,17alpha-methylenedioxy-21-propionyloxy-1,4-pregnadiene-3,20-dione