N-Substituted β-ketoamidines are obtained readily by condensing N-substituted thioureas 6 with α-halogenoketones 5 and extruding the sulfur from the resulting acylmethylisothiourea 7 with triphenylphosphine (sulfide contraction).
N-取代的β-ketoamidines是通过缩合的N-取代的
硫脲容易地得到6用α-halogenoketones 5和挤压从所得acylmethylisothiourea
硫7与
三苯基膦(
硫化物收缩)。