Synthesis of 2,3-dihydro-1 3-thiazin-4(1H)ones and their remarkably facile recyclization to 2,3-dihydropyrimidin-4(1H)-ones

被引:14
|
作者
Vovk, MV [1 ]
Sukach, VA [1 ]
Chernega, AN [1 ]
Pyrozhenko, VV [1 ]
Bol'but, AV [1 ]
Pinchuk, AM [1 ]
机构
[1] Natl Acad Sci Ukraine, Inst Organ Chem, Kiev, Ukraine
关键词
D O I
10.1002/hc.20129
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Functionalized2,3-dihydro-1,3-thiazin-4 (1 H)-one derivatives have been synthesized by cyclo-condensation of 3-alkyl(aryl)amino-2-cyano-3-mercaptoacrylamides with aldehydes and ketones under acidic catalysis. 6-Alkyl(aryl)amino-5-cyano-2,3-dihydro- 1, 3-thiazin-4 (1H)-ones, when treated with a dilute solution of potassium hydroxide, are converted into the potassium salts of isomeric compounds, 1-alkyl(aryl)-5-cyano-6-mercapto-2,3-dihydropyrimidin-4(1H)-ones. Alkylation of the latter with dimethyl sulfate in situ furnishes 1-alkyl(aryl)-6-alkylthio-5cyano-2,3-dihydropyrimidin-4(1H)-ones, whereas boiling them in ethanol with an excess of hydrochloric acid leads to starting 2,3-dihydro-1,3-thiazin-4(1H)ones. (c) 2005 Wiley Periodicals, Inc.
引用
收藏
页码:426 / 436
页数:11
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