作者:Philip E. Morris、Arthur J. Elliott、John A. Montgomery
DOI:10.1002/jhet.5570360214
日期:1999.3
based on our improved pyrrole synthesis (Scheme 1). The syntheses of the novel thiophenes 6 are described. The guanylation of 5 and 6 were studied and compared to 2. The 3-amino group of 5 and 6 failed to react with 3 or 4 under mild acid catalysis; conditions under which 2 easily condensed. Guanylation was finally achieved by generating the carbodiimide intermediate of 3 under mercury catalysis affording
在最近的出版物中,我们已经描述了7-取代的-2-氨基-1,5-二氢-4 H-吡咯并[3,2 - d ]嘧啶-4-酮的合成,它们是嘌呤酶的有效抑制剂。来自相应的3-氨基吡咯-2-羧酸酯的核苷磷酸化酶。合成中的关键步骤是氨基与高反应性鸟苷酸化试剂3或4缩合,然后进行环合。呋喃[3,2- d ]嘧啶-4-酮和噻吩并[3,2- d] pyridin-4-one是紧密相关的环系统。然而,在文献中尚未报道这些环带有2-氨基取代基,该取代基将由这种鸟苷化反应产生。在本报告中,基于改进的吡咯合成方法描述了新型呋喃5的合成方法(方案1)。描述了新型噻吩6的合成。研究了5和6的鸟嘌呤化并将其与2比较。在温和的酸催化下5和6的3-氨基不能与3或4反应。2的条件容易凝结。通过在汞催化下生成3的碳二亚胺中间体,最终实现鸟苷酸化,得到鸟苷化的加合物,将其转变为新型的2-氨基噻吩并呋喃并[3,2 - d ]嘧啶-4-酮16。