Stereoselective intramolecular hetero Diels–Alder reactions of 1-oxa-1,3-butadienes: a novel approach for the synthesis of complex annulated uracils
作者:Ipsita Devi、Pulak J. Bhuyan
DOI:10.1016/j.tetlet.2004.08.072
日期:2004.10
The intramolecular hetero Diels–Alder reactions of 1-oxa-1,3-butadienes 4, obtained from salicylaldehyde 1 via O-allylation followed by Knoevenagel condensation with barbituric acids 3 in the presence of hydrochloric acid as catalyst, affords the tetracyclic uracil derivatives 5 and 6 in a stereoselective manner and high overall yields.
的1-氧杂-1,3-丁二烯分子内杂狄尔斯-阿尔德反应4,从得到的水杨醛1经由ö -allylation接着Knoevenagel缩合与巴比土酸的3在盐酸作为催化剂存在下,得到四环尿嘧啶衍生物5和6以立体选择的方式和高的总产率。