Synthetic Studies on Novel 1,4-Dihydro-2-methylthio-4,4,6-trisubstituted Pyrimidine-5-carboxylic Acid Esters and Their Tautomers
作者:Yoshio Nishimura、Yasuko Okamoto、Masaya Ikunaka、Yoshihiko Ohyama
DOI:10.1248/cpb.59.1458
日期:——
at various temperatures and nuclear Overhauser enhancement spectroscopy (NOESY) experiment. Because these dihydropyrimidine products are otherwise inaccessible and thus hitherto unavailable, the synthetic methods established in this study will help to expand the molecular diversity of their related derivatives.
1,4-二氢-2-甲硫基烷基-4,4,6-三取代嘧啶-5-羧酸烷基酯1及其互变异构体烷基1,6-二氢-2-甲硫基-4,6,6-三取代烷基的混合物嘧啶-5-羧酸盐2是通过S-甲基异硫脲半硫酸盐3与2-(gem-di取代)亚甲基-3-氧酸酯4的Atwal-Biginelli环缩合反应合成的,可以通过Lehnert程序进行萃取,以进行Knoevenagel型缩合。彼此不可分离的Atwal-Biginelli环缩合反应的互变异构产物1和2的结构通过(1)在不同温度下的1 H-NMR光谱和核Overhauser增强光谱(NOESY)实验明确确定。由于这些二氢嘧啶产品否则无法获得,因此迄今无法获得,