Pyridopyrimidines. X. Synthesis of 3-Substituted 2-Thioxo-5,7-dimethylpyrido[2,3-<i>d</i>] pyrimidin-4(3<i>H</i>)-ones and their<i>S</i>-Alkylation Under Phase Transfer Conditions
作者:Chaitanya G. Dave、Killol J. Patel
DOI:10.1002/jhet.5570380223
日期:2001.3
2-Thioxo-5,7-dimethylpyrido[2,3-d]pyrimidin-4(3H)-ones 3 were synthesized by the cyclocondensation of 2-amino-3-carbethoxy-4,6-dimethylpyridine 1 with methyl-N-aryldithiocarbamates 2 and compared with the condensation between 1 and aryl isothiocyanates 4. When a comparative study of N vs S alkylation of ambident 2-thioxo-5,7-dimethylpyrido[2,3-d]pyrimidin-4(3H)-ones 3 was carried out under liquid-liquid
通过2-氨基-3-甲乙氧基-4,6-二甲基吡啶1与甲基-N的环缩合反应,合成了2-噻氧基-5,7-二甲基吡啶[2,3- d ]嘧啶-4(3 H)-ones 3。 -芳基二硫代氨基甲酸酯2并与1和芳基异硫氰酸酯4的缩合比较。当比较环境2-硫代-5,7-二甲基吡啶并[2,3 - d ]嘧啶-4(3 H)-的N与S烷基化的比较研究时者3使用各种烷基化剂液-液和固-液相转移条件下进行5中,小号烷基化产物6 是专门和有选择地获得的。