ethyl (6R)-6-[(1R,3aS,4E,7aR)-4-[(2Z)-2-[(3S,5R)-3,5-bis[[tert-butyl(dimethyl)silyl]oxy]-2-methylidenecyclohexylidene]ethylidene]-7a-methyl-2,3,3a,5,6,7-hexahydro-1H-inden-1-yl]-3-ethyl-4-hydroxy-2-methylideneheptanoate 在
lithium hydroxide 、 lithium tetrafluoroborate 、
硫酸 作用下,
以
四氢呋喃 、
甲苯 、
乙腈 为溶剂,
反应 2.0h,
生成 20(R)-(tetrahydro-3-methylene-2-furanone-4-ethyl-5-yl)methyl-9,10-secopregna-5(Z),7(E),10(19)-triene-1α,3β-diol 、 20(R)-(tetrahydro-3-methylene-2-furanone-4-ethyl-5-yl)methyl-9,10-secopregna-5(Z),7(E),10(19)-triene-1α,3β-diol 、 20(R)-(tetrahydro-3-methylene-2-furanone-4-ethyl-5-yl)methyl-9,10-secopregna-5(Z),7(E),10(19)-triene-1α,3β-diol 、 20(R)-(tetrahydro-3-methylene-2-furanone-4-ethyl-5-yl)methyl-9,10-secopregna-5(Z),7(E),10(19)-triene-1α,3β-diol