(3aS,5R,5aS,8R,10S,10aS)-10-ethyl-2,2,5,9,9-pentamethyl-10-(prop-1-en-2-yl)decahydro-6H-5a,8-methanocyclopenta[c]azulene 在
吡啶 、
苯磺酰氯 作用下,
反应 3.0h,
以72%的产率得到(1S,3a'S,5'R,5a'S,8'R,10a'S)-2',2',5',9',9'-pentamethyl-2-methylenedecahydrospiro[cyclobutane-1,10'-[5a,8]methanocyclopenta[c]azulene]