4-benzoyl-5-phenyl-furan-2,3-dione 、 (R,S)-8-(2-methoxy-5-methylphenyl)-1,3,3,9-tetramethyl-2-azaspiro[4.5]deca-1,7-dien-6-one 以
苯 为溶剂,
以92%的产率得到(Z)-3-benzoyl-5-{3,3,9-trimethyl-8-(5-methyl-2-methoxyphenyl)-6-oxo-2-azaspiro[4.5]dec-7-ene-1-ylidene}-4-phenylcyclopent-3-ene-1,2-dione