Diphosphorus pentaoxide in organic synthesis, XXVII. A one-step synthesis of thiazolo[5,4-d]pyrimidin-7-amines and purine-6-thiones from 5-(acylamino)-2-methyl-4-thiazolecarboxamides
作者:Knud Erik Andersen、Mahmoud Hammad、Erik B. Pedersen
DOI:10.1002/jlac.198619860711
日期:1986.7.14
5-(Acylamino)-2-methyl-4-thiazolecarboxamides 1 have been converted into a series of N-arylthiazolo[5,4-d]pyrimidin-7-amines 2 and 9-aryl-1,9-dihydro-6H-purine-6-thiones 3 by heating in a mixture of diphosphorus pentaoxide, triethylamine hydrochloride, and an appropriate substituted aniline at 240°C for 2 min and then at 160°C for 1 h. The ratio of 2 and 3 depends on the aniline and thiazole used.
5-(酰基氨基)-2-甲基-4-噻唑羧酰胺1已转化为一系列N-芳基噻唑并[5,4- d ]嘧啶7-胺2和9-芳基-1,9-二氢-6 H通过在五氧化二磷,三乙胺盐酸盐和适当的取代苯胺的混合物中于240°C加热2分钟,然后在160°C加热1小时,生成-嘌呤6-硫酮3。2和3的比例取决于所用的苯胺和噻唑。