One-pot synthesis of 4-aryl-2-cyanoimino-3,4-dihydro-1H-pyrimidines and their reactions
摘要:
A series of 4-aryl-2-cyanoimino-3,4-dihydro-1H-pyrimidines was obtained as a result of a multicomponent Biginelli reaction using 1,3-dicarbonyl compounds, aromatic aldehydes, and cyanamide. Alkylation of the obtained compounds with benzyl chloride takes place at the two nitrogen atoms of the tetrahydropyrimidine ring, while oxidation with manganese dioxide leads to the corresponding 1-(pyrimidin-2-yl)carbamides or pyrimidine-2-amines, depending on the conditions.
Direct amination of pyrimidin-2-yl tosylates with aqueous ammonia under metal-free and mild conditions
作者:Hai-Peng Gong、Yue Zhang、Yu-Xia Da、Zhang Zhang、Zheng-Jun Quan、Xi-Cun Wang
DOI:10.1016/j.cclet.2015.01.034
日期:2015.6
A metal-freesynthesis of pyrimidine functionalized primary amines via direct amination of pyrimidin-2-yl tosylate with aqueous ammonia has been developed under mild conditions. The desired products pyrimidin-2-amines can be generated in excellent yields in PEG-400, without any catalysts or other additives.