2,2-二甲基琥珀酸酐 、
(3β)-3-hydroxy-N-(pyridin-2-ylmethyl)lup-20(29)-en-28-amide 在
吡啶 、
4-二甲氨基吡啶 作用下,
生成 4-[[(1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-5a,5b,8,8,11a-pentamethyl-1-prop-1-en-2-yl-3a-(pyridin-2-ylmethylcarbamoyl)-1,2,3,4,5,6,7,7a,9,10,11,11b,12,13,13a,13b-hexadecahydrocyclopenta[a]chrysen-9-yl]oxy]-2,2-dimethyl-4-oxobutanoic acid