Cycloadditions of 1,2,3-Triazines Bearing C5-Electron Donating Substituents: Robust Pyrimidine Synthesis
作者:Christopher M. Glinkerman、Dale L. Boger
DOI:10.1021/acs.orglett.5b01870
日期:2015.8.21
The examination of the cycloaddition reactions of 1,2,3-triazines 17–19, bearing electron-donating substituents at C5, are described. Despite the noncomplementary 1,2,3-triazine C5 substituents, amidines were found to undergo a powerful cycloaddition to provide 2,5-disubstituted pyrimidines in excellent yields (42–99%; EDG = SMe > OMe > NHAc). Even select ynamines and enamines were capable of cycloadditions
的1,2,3-三嗪的环加成反应的检查17 - 19,轴承供电子取代基在C5,进行说明。尽管有非互补的1,2,3-三嗪C5取代基,但发现am可进行强力的环加成反应,从而以优异的收率(42–99%; EDG = SMe> OMe> NHAc)提供2,5-二取代的嘧啶。甚至选择的乙胺和烯胺也能与17而不是18或19进行环加成反应,从而以适中的收率(分别为37-40%和33%)提供三取代的吡啶。