Toluene-4-sulfonic acid (1R,2R,3aS,4R,5S,7aR)-1-ethyl-2-methyl-5-((S)-3-oxo-cyclopentyl)-2,3,3a,4,5,7a-hexahydro-1H-inden-4-ylmethyl ester 在
potassium tert-butylate 作用下,
以
叔丁醇 、
苯 为溶剂,
反应 20.0h,
以92%的产率得到(2R,3R,3aR,5aS,5bR,8aS,9aR,9bR)-3-Ethyl-2-methyl-1,2,3,3a,5a,5b,6,7,8a,9,9a,9b-dodecahydro-cyclopenta[b]-as-indacen-8-one