(1R,7S,8R,12R)-11-benzhydrylidene-1,7-diphenyl-4-oxa-13-thia-3,5-diazatetracyclo[5.5.1.02,6.08,12]trideca-2,5,9-triene 、
丁炔二酸二甲酯 以48%的产率得到3-((1R,3S,3aS,6aS)-4-Benzhydrylidene-3-cyano-1,3-diphenyl-3,3a,4,6a-tetrahydro-1H-cyclopenta[c]thiophen-1-yl)-isoxazole-4,5-dicarboxylic acid dimethyl ester