Acid-catalyzed reaction of 3-aminopyrrole with s-tetrazines: formation of 1H-1,2,4-(triazol-3-yl)pyrimidines via an unprecedented s-tetrazine-ring contraction and concomitant pyrrole-ring expansion
作者:Michael De Rosa、David Arnold、Hemant Yennawar
DOI:10.1016/j.tetlet.2014.08.004
日期:2014.10
Initial reaction of 3-aminopyrrole with the conjugate acid of 3,6-diphenyl-1,2,4,5-tetrazine gave an intermediate that rearranged to a 1H-1,2,4-(triazol-3-yl)pyrimidine via an unprecedented cascade. In this cascade, the s-tetrazine-ring opened, contracted to a 1,2,4-triazole-ring, and the pyrrolering expanded to a pyrimidine. Similar results were obtained with three other electronically different
3-氨基吡咯与3,6-二苯基-1,2,4,5-四嗪的共轭酸的初始反应产生中间体,该中间体重排为1 H -1,2,4-(三唑-3-基)嘧啶通过前所未有的级联。在该级联反应中,s-四嗪环打开,收缩为1,2,4-三唑环,吡咯环扩展为嘧啶。用其他三种电子上不同的s-四嗪也获得了相似的结果。
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