4-苯基-1,2,4-三唑啉-3,5-二酮 、
6,7-Dicyan-2,3,3a,7a-tetrahydro-2,2-dimethyl-4-(triphenylphosphoranylidenamino)benzofuran-3a-carbonsaeure-ethylester 以
乙腈 为溶剂,
反应 4.0h,
以81%的产率得到rac-ethyl (4R,10S)-10,11-dicyano-2,2-dimethyl-6,8-dioxo-7-phenyl-4-((triphenyl-l5-phosphaneylidene)amino)-2,3,7,8,10,10a-hexahydro-6H-4,10-ethenofuro[2,3-d][1,2,4]triazolo[1,2-a]pyridazine-3a(4H)-carboxylate