The reactions of N-benzoyl-N′-(o-cyanoaryl)thioureas with ethyl bromoacetate under alkaline conditions led to the formation of either fused 2-(alkylsulfanyl)-4-aminopyrimidines or 2-(benzoylimino)-3-(o-cyanoaryl)thiazolidin-4-ones. The accurate application of slightly different reaction conditions allowed us to adjust the balance between the formation of the pyrimidine or thiazolidine heterocycles. Atropisomerism in the 3-(o-cyanoaryl)thiazolidin-4-ones was influenced by the size of the o-cyanoaryl ring, which was investigated by means of NMR measurements and theoretical calculations.
在碱性条件下,N-苯甲酰基-N′-(邻
氰基芳基)
硫脲与
溴乙酸乙酯反应,生成融合的 2-(烷基
硫酰基)-4-
氨基嘧啶或 2-(苯甲酰基亚
氨基)-3-(邻
氰基芳基)
噻唑烷-4-酮。通过准确地应用略有不同的反应条件,我们可以调整
嘧啶或
噻唑烷杂环形成之间的平衡。3-(o-
氰基芳基)
噻唑烷-4-酮中的异构体受邻
氰基芳基环大小的影响,这一点通过核磁共振测量和理论计算进行了研究。