Synthesis of pyrido[2,3-<i>d</i>]pyrimidinones by the reaction of aminopyrimidin-4-ones with benzylidene meldrum's acid derivatives
作者:Jairo Quiroga、Angelina Hormaza、Braulio Insuasty、Manuel Nogueras、Adolfo Sánchez、Norbert Hanold、Herbert Meier
DOI:10.1002/jhet.5570340228
日期:1997.3
A series of pyrido[2,3-d]pyrimidine-4,7-diones 5a-h were prepared from 6-amino-4-pyrimidones 1 and benzylidene Meldrum's acid derivatives 2 by cyclization reactions in boiling nitrobenzene. The structure of 5, determined by nmr measurements, reveals a selective orientation of 1 and 2 in the addition step.
在沸腾的硝基苯中通过环化反应由6-氨基-4-嘧啶酮1和亚苄基Meldrum的酸衍生物2制备了一系列的吡啶并[2,3 - d ]嘧啶-4,7-二酮5a-h 。通过nmr测量确定的5的结构在加成步骤中显示1和2的选择性方向。