The dramatic effect of thiophenol on the reaction pathway of ethyl 4-chloromethyl-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate with thiophenolates: ring expansion versus nucleophilic substitution
作者:Anastasia A. Fesenko、Ludmila A. Trafimova、Dmitry A. Cheshkov、Anatoly D. Shutalev
DOI:10.1016/j.tetlet.2010.07.098
日期:2010.9
result of ring expansion and/or nucleophilic substitution. The reaction pathway was affected strongly by the basicity–nucleophilicity of the reaction media. The results obtained were confirmed by reactions of 4-mesyloxymethyl-6-methyl-5-tosyltetrahydropyrimidin-2-one with PhSNa/PhSH and ethyl 4-chloromethyl-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate with NaCN/HCN or NaCH(COOEt)2/CH2(COOEt)2
4-甲基-2-氧代-7-苯硫基-2,3,6,7-四氢-1 H -1,3-二氮杂-5-羧酸酯和/或6-甲基-2-氧代-4-(在4-氯甲基-6-甲基-2-氧-2-,1,2,3,4-四氢嘧啶-5-羧酸乙酯与PhSNa的反应中获得苯硫基甲基)-1,1,2,3,4-四氢嘧啶-5-羧酸酯环的扩展和/或亲核取代的结果,取决于试剂比率,反应时间或温度,有无PhSH的PhSK或PhSK。反应途径受到反应介质的碱性-亲核性的强烈影响。通过4-甲氧基氧甲基-6-甲基-5-甲苯磺酰基四氢嘧啶-2-酮与PhSNa / PhSH和乙基4-氯甲基-6-甲基-2-氧代-1,2,3,4-四氢嘧啶的反应证实了所获得的结果用NaCN / HCN或NaCH(COOEt)2 -5-羧酸盐/ CH 2(COOEt)2。