Synthesis of functionalized tetrahydro-1,3-diazepin-2-ones and 1-carbamoyl-1H-pyrroles viaring expansion and ring expansion/ring contraction of tetrahydropyrimidines
作者:Anastasia A. Fesenko、Ludmila A. Trafimova、Anatoly D. Shutalev
DOI:10.1039/c1ob06284k
日期:——
based on the ring expansion reaction of 1,2,3,4-tetrahydropyrimidin-2-ones under the action of nucleophiles has been developed. The first step of the synthesis was preparation of N-[(2-benzoyloxy-1-tosyl)ethyl]urea by three-component condensation of 2-benzoyloxyethanal, urea and p-toluenesulfinic acid. Nucleophilic substitution of the tosyl group in the obtained sulfone with sodium enolates of α-phenylthioketones
基于1,2,3,4-四氢嘧啶-2-的扩环反应制备6-苯硫基取代的2,3,4,5-四氢-1 H -1,3-二氮杂-2-酮的一般方法已经开发了在亲核试剂作用下的药物。合成的第一步是通过三组分缩合制备N -[(2-苯甲酰氧基-1-甲苯磺酰基)乙基]脲。2-苯甲酰氧基乙缩醛, 尿素 和 对甲苯磺酸。用α-苯基硫酮的烯醇钠对所得砜中的甲苯磺酰基进行亲核取代,然后环化-脱水,再进行苯甲酰化,得到4-羟基甲基-5-苯基硫代1,2,3,4-四氢嘧啶-2-酮合成4-甲磺酰氧基甲基衍生物。用亲核试剂(例如NaCN)处理后者丙二酸二乙酯钠,PhSNa,MeONa,NaBH 4,琥珀酰亚胺钠或邻苯二甲酰亚胺钾,提供了目标多功能的二氮杂pin酮。由于环收缩,在酸性条件下,将获得的6-苯硫基-二氮杂庚酮及其6-甲苯磺酰基取代的类似物转化为3-取代的1-氨基甲酰基-1 H-吡咯。使用环扩展/环收缩序列实现了从4-甲甲氧基甲基-嘧啶有效地一锅合成。