The reaction of 2-and 4-pyrimidinecarbaldehydes with reagents such as ethoxycarbonyl-(1) and benzoyl-(triphenylphosphino) methanide (2) gave pyrimidines with an α, β-unsaturated carbonyl group. The reagents (1, 2) reacted with 2- and 4-acetylpyrimidines to give similar products, as expected. 4-(1-Chloroethyl) pyrimidines did not react with triphenylphosphine, though chloro-methylpyrimidines are know to give Wittig reagents.
2-和4-
吡啶羧醛与如乙氧基碳酰基-(1)和苯甲酰-(
三苯基膦)
甲烷化物(2)等试剂的反应生成了带有α, β-不饱和羰基的
吡啶。试剂(1, 2)与2-和
4-乙酰吡啶反应,得到了类似的产物,正如预期的那样。虽然已知
氯代
甲基吡啶能生成Wittig试剂,但4-(1-
氯乙基)
吡啶与
三苯基膦没有反应。