反-3,4,4-三甲基-2-戊烯 、 6β-methoxy-3α,5-cyclo-5α-23,24-dinorcholan-22-iodide 在
正丁基锂 、
potassium tert-butylate 作用下,
生成
(1aS,3aR,3bS,5aR,6R,8aS,8bS,10R,10aR)-10-Methoxy-3a,5a-dimethyl-6-((E)-(R)-1,5,6,6-tetramethyl-hept-4-enyl)-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalene 、 (1aS,3aR,3bS,5aR,6R,8aS,8bS,10R,10aR)-6-((R)-3-tert-Butyl-1,3-dimethyl-pent-4-enyl)-10-methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalene 、 (1aS,3aR,3bS,5aR,6R,8aS,8bS,10R,10aR)-10-Methoxy-3a,5a-dimethyl-6-((R)-1,3,5,5-tetramethyl-4-methylene-hexyl)-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalene 、
(1aS,3aR,3bS,5aR,6R,8aS,8bS,10R,10aR)-6-((E)-(R)-4-tert-Butyl-1-methyl-hex-4-enyl)-10-methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalene