A Reagent, Ethyl 2-(2-tert-Butyl-2H-tetrazol-5-yl)-3-(dimethylamino)acrylate (DMTE), for Facile Synthesis of 2,3-(Ring Fused)-5-(5-teratzolyl)-4H-pyrimidin-4-one Derivatives.
作者:Hideyuki KANNO、Hitoshi YAMAGUCHI、Yoshifumi ICHIKAWA、Sumiro ISODA
DOI:10.1248/cpb.39.1099
日期:——
A method for synthesizing 2, 3-(ring fused)-5-(5-tetrazolyl)-4H-pyrimidin-4-one derivative from ethyl 2-(2-tert-butyl-2H-tetrazol-5-yl)-3-(dimethylamino)acrylate (DMTE) (4a) and amino-heterocycles is described. The structure of DMTE, which was prepared from ethyl (2-tert-butyl-2H-tetrazol-5-yl)acetate (3a) with dimethylformamide diethylacetal, was determined by X-ray analysis to be Z form. The reaction of 2-amino-5-methyloxazole (6) with DMTE in acetic acid gave the oxazolo[3, 2-a]pyrimidine derivative (8), heating of which in concentrated sulfuric acid afforded the desired tetrazole derivative (20). Pyrimido[2, 1-b]benzothiazole (21), pyrazolo[1, 5-a]pyrimidine (22 and 23) and [1, 2, 4]triazolo[1, 5-a]pyrimidine (24) derivatives were prepared in a similar manner.
描述了一种由 2-(2-叔丁基-2H-四唑-5-基)-3-(二甲基氨基)丙烯酸乙酯 (DMTE) (4a) 和氨基杂环合成 2,3-(环融合)-5-(5-四唑基)-4H-嘧啶-4-酮衍生物的方法。DMTE 由 (2-tert-butyl-2H-tetrazol-5-yl)ethyl acetate (3a) 与二甲基甲酰胺二乙缩醛制备而成,通过 X 射线分析确定其结构为 Z 型。2-amino-5-methyloxazole (6) 与 DMTE 在乙酸中反应得到噁唑并[3, 2-a]嘧啶衍生物 (8),在浓硫酸中加热得到所需的四唑衍生物 (20)。嘧啶并[2,1-b]苯并噻唑(21)、吡唑并[1,5-a]嘧啶(22 和 23)和[1,2,4]三唑并[1,5-a]嘧啶(24)衍生物的制备方法类似。