Synthesis of 2,3-dihydro-1,3-thiazin-4(1H)- ones and their remarkably facile recyclization to 2,3-dihydropyrimidin-4(1H)-ones
作者:Mykhaylo V. Vovk、Volodymyr A. Sukach、Alexander N. Chernega、Volodymyr V. Pyrozhenko、Andriy V. Bol'but,、Alexander M. Pinchuk
DOI:10.1002/hc.20129
日期:——
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-5- cyano-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. © 2005 Wiley Periodicals, Inc. Heteroatom Chem 16:426–436, 2005; Published online in
功能化的 2,3-二氢-1,3-thiazin-4(1H)-one 衍生物已通过 3-烷基(芳基)氨基-2-氰基-3-巯基丙烯酰胺与醛和酮在酸性催化下的环缩合反应合成。6-烷基(芳基)氨基-5-氰基-2,3-二氢-1,3-噻嗪-4(1H)-酮,当用氢氧化钾的稀溶液处理时,转化为异构化合物,1-烷基-(芳基)-5-氰基-6-巯基-2,3-二氢嘧啶-4(1H)-ones。后者用硫酸二甲酯在原位烷基化得到 1-烷基(芳基)-6-烷硫基-5-氰基-2,3-二氢嘧啶-4(1H)-酮,而在乙醇中用过量的盐酸煮沸会导致到起始 2,3-dihydro-1,3-thiazin-4(1H)-ones。© 2005 Wiley Periodicals, Inc. 杂原子化学 16:426–436, 2005; 在线发表于 Wiley InterScience (www.interscience.wiley.com)。DOI