A Novel Microwave-assisted One-pot Synthesis of Pyrano[2,3-<i>d</i>]pyrimidines and Pyrido[2,3-<i>d</i>]pyrimidines via a Three Component Reaction in Solvent-Free Condition
作者:Pulak J. Bhuyan、Ipsita Devi
DOI:10.1055/s-2003-43367
日期:——
nitriles 3 in presence of acetic anhydride proceeds under microwave-assisted conditions to give pyrano[2,3-d]pyrimidines 4 in excellent yields. 6-Aminouracils 5 or 6-hydroxy-aminouracils 7 react with 2 and 3 under identical conditions to yield pyrido[2,3-d]pyrimidines 6 or pyrido[2,3-d]pyrimidine oxides 8 in high yields.
在乙酸酐存在下,巴比妥酸 1、原甲酸三乙酯 2 和烷基腈 3 的三组分环缩合反应在微波辅助条件下进行,以优异的收率得到吡喃并 [2,3-d] 嘧啶 4。6-氨基尿嘧啶5或6-羟基-氨基尿嘧啶7在相同条件下与2和3反应以高产率产生吡啶并[2,3-d]嘧啶6或吡啶并[2,3-d]嘧啶氧化物8。