作者:Edward C. Taylor、Mona Patel
DOI:10.1002/jhet.5570280810
日期:1991.12
Treatment of heterocyclic o-aminonitriles and o-aminoesters 1a-5a with dibromotriphenylphosphorane gives iminophosphoranes 1b-5b which undergo a facile aza-Wittig reaction at room temperature with phenyl isocyanate to provide the carbodiimides 1c-5c. Treatment of the latter intermediates with ammonia leads to intramolecular ring closure of the initially formed guanidines to provide the fused 4-aminopyrimidines
用二溴三苯基膦处理杂环邻氨基腈和邻氨基酯1a-5a得到亚氨基正膦1b-5b,其在室温下与异氰酸苯酯进行简单的氮杂-维蒂希反应以提供碳二亚胺1c-5c。用氨处理后面的中间体导致最初形成的胍的分子内闭环,以提供稠合的4-氨基嘧啶和4(3H)-嘧啶酮1d-Sd。