(1S,3aS,5aR,5bR,7aR,11aR,11bR,13aR,13bR)-1-isopropyl-5a,5b,8,8,11a-pentamethyl-3a-((tetrahydro-2H-pyran-2-yloxy)methyl)octadecahydro-1H-cyclopenta[a]chrysen-9(5bH)-one 、
甲酸乙酯 在
sodium methylate 作用下,
以
苯 为溶剂,
反应 2.0h,
以96%的产率得到(1S,3aS,5aR,5bR,7aR,11aR,11bR,13aR,13bR)-1-isopropyl-5a,5b,8,8,11a-pentamethyl-9-oxo-3a-((tetrahydro-2H-pyran-2-yloxy)methyl)icosahydro-1H-cyclopenta[a]chrysene-10-carbaldehyde