通过在2位带有各种β和γ-氨基醇的嘧啶9或嘧啶酮10的分子内环化反应,合成了几种类型1和2的咪唑基和嘧啶并[1,2- a ]嘧啶酮。在Mitsunobu条件下10型嘧啶酮的闭环会产生双环区域异构体1和2的混合物。用H 2 SO 4处理9型嘧啶为获得咪唑和嘧啶[1,2- a ]嘧啶酮提供了有效且操作简单的一锅水解-环化程序作为唯一的区域异构双环产物,收率良好,为1。
Polyfunctional Derivatives of Isocytosine: I. Intramolecular Rearrangement of 6-Methyl-4-oxo-2-[2-(phenylcarbamoyloxy)ethyl]aminodihydro-3H-pyrimidine
作者:A. V. Erkin、V. I. Krutikov、A. V. Kosykh
DOI:10.1007/s11176-005-0516-3
日期:2005.11
The reaction of 2-(2-hydroxyethyl)amino-6-methyl-4-oxodihydro-3H-pyrimidine with phenyl isocyanate yields 6-methyl-4-oxo-2-[2-(phenylcarbamoyloxy)ethyl]dihydro-3H-pyrimidine, which rearranges into 2-(2-hydroxyethyl)amino-6-methyl-4-oxo-5-phenylcarbamoyldihydro-3H-pyrimidine under the action of HCl.
Sen,A.B.; Gupta,S.K., Journal of the Indian Chemical Society, 1962, vol. 39, p. 129 - 134
作者:Sen,A.B.、Gupta,S.K.
DOI:——
日期:——
Kawai, Scientific Papers of the Institute of Physical and Chemical Research (Japan), 1931, vol. 16, p. 24,26
作者:Kawai
DOI:——
日期:——
Polyfunctional isocytosine derivatives: II. Regioselectivity of methylation of 2-(2-hydroxyethylamino)-6-methylpyrimidin-4(3H)-one in different media
作者:A. V. Erkin、V. I. Krutikov
DOI:10.1134/s1070363206030194
日期:2006.3
High regioselectivity in the methylation of 2-(2-hydroxyethylamino)-6-methylpyrimidin-4(3H)C, one at the N-3 atom in water and ethanol in the presence of inorganic bases is determined by participation of the oxygen atom in hydrogen bonding and its coordination to metal cation, respectively. In going to aprotic dimethylformamide which is capable of solvating cations, the regioselectivity decreases, and a mixture of N-3- and O-methyl isomers is formed.