16,17-[(cyclohexylmethylene)bis(oxy)]-11,21-dihydroxypregna-1,4-diene-3,20-dione[11beta, 16alpha(R,S)] 、
异丁酸酐 在
potassium carbonate 作用下,
以
丙酮 为溶剂,
反应 2.5h,
以99.3%的产率得到16,17-[(cyclohexylmethylene)bis(oxy)]-11-hydroxy-21-(2-methyl-1-oxopropoxy)pregna-1,4-diene-3,20-dione[11beta, 16alpha(R,S)]