Benzonitrile p-nitrobenzylide (5) undergoes 1,3-dipolar cyclo-additions in the presence of 3-phenyl-2H-azirines (1), yielding in benzene at 0° 2-(p-nitrophenyl)-4,5-diphenyl-1,3-diazabicyclo[3.1.0]hex-3-enes (7, scheme 2). Under the basic conditions of the reaction mixture, 7 a and 7 b are partially converted to 2-(p-nitrophenyl)-4,5-diphenyl-1,6-dihydropyrimidines (8a, b) which are dehydrogenated
在3-苯基-2 H-
叠氮基(1)存在下1,-偶极环加成的
苯甲腈对硝基苄基(进行中5),在0°2-的苯中生成(对
硝基苯基)-4, 5
-二苯基-1,3-二
氮杂双环[3.1.0]己-3-烯(7,方案2)。在反应混合物的碱性条件下,7a和7b部分转化为2-(对
硝基苯基)-4,5
-二苯基-1,6-二氢
嘧啶(8a,b),并通过
氧气脱氢成相应的
嘧啶9a和9b。