Pyrimidine reactions. Part XVII. Ring fission of 1,2-dihydro-2-imino-1-methyl-, 5-methylsulphonyl-, and 5-methylsulphinyl-pyrimidine by amines
作者:D. J. Brown、P. W. Ford、M. N. Paddon-Row
DOI:10.1039/j39680001452
日期:——
by a tertiary amine (triethylamine) but in a secondary amine (pure diethylamine) it undergoes Dimroth rearrangement to 2-methylaminopyrimidine. In a primary amine (butylamine but not aniline) it suffers ring fission to give 1,3-dibutyliminopropane, which is shown to exist in an intramolecularly hydrogen-bonded form; in hydrazine hydrate it is converted into pyrazole. 5-Methylsulphonyl- and 5-methyl
1,2-二氢-2-亚氨基-1-甲基嘧啶不受叔胺(三乙胺)的影响,但在仲胺(纯二乙胺)中,它会发生Dimroth重排为2-甲基氨基嘧啶。在伯胺(丁胺而不是苯胺)中,它会发生环裂变而生成1,3-二丁基亚氨基丙烷,该分子以分子内氢键的形式存在。在水合肼中将其转化为吡唑。已显示5-甲基磺酰基-和5-甲基磺酰基-嘧啶在水溶液中作为阳离子共价水合,在伯烷基胺(戊胺或苄胺)中经历类似的环裂解,得到2-甲基磺酰基-1,3-二戊基亚氨基丙烷或适当的类似物。