(1R,3aS,5aR,5bR,7aR,11aR,11bR,13aR,13bR)-5a,5b,8,8,11a-pentamethyl-9-oxo-1-(prop-1-en-2-yl)-3a-((tetrahydro-2H-pyran-2-yloxy)methyl)-2,3,3a,4,5,5a,5b,6,7,7a,8,9,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysene-10-carbaldehyde 在
4-甲基苯磺酸吡啶 、
对甲苯磺酸 作用下,
以
乙醇 为溶剂,
反应 16.0h,
生成 (1R,3aS,5aR,5bR,7aR,11aR,11bR,13aR,13bR)-10-(ethoxy(hydroxy)methyl)-3a-(hydroxymethyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)-2,3,3a,4,5,5a,6,7,7a,8,11a,11b,12,13,13a,13b-hexadecahydro-1H-cyclopenta[a]chrysen-9(5bH)-one 、 (1R,3aS,5aR,5bR,7aR,11aR,11bR,13aR,13bR)-10-(ethoxy(hydroxy)methyl)-3a-(hydroxymethyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)-2,3,3a,4,5,5a,6,7,7a,8,11a,11b,12,13,13a,13b-hexadecahydro-1H-cyclopenta[a]chrysen-9(5bH)-one