Concise and Efficient Access to 5,7-Disubstituted Pyrazolo[1,5-<i>a</i>]pyrimidines by Pd-Catalyzed Sequential Arylation, Alkynylation and SN<sub>Ar</sub>Reaction
作者:Badr Jismy、Gérald Guillaumet、Hassan Allouchi、Mohamed Akssira、Mohamed Abarbri
DOI:10.1002/ejoc.201701024
日期:2017.11.9
A simple and efficient method for synthesis of 5,7-disubstituted pyrazolo[1,5-a]pyrimidines is reported. The synthetic route involved first a one-pot two-step synthesis of 7-substituted pyrazolo[1,5-a]pyrimidin-5-ones from the reaction of 3-aminopyrazole 1 with activated alkynes. These compounds were used as key intermediates to access, with excellent yields, a library of new 5,7-disubstituted pyrazolo[1
报道了一种简单有效的合成 5,7-二取代吡唑并 [1,5-a] 嘧啶的方法。合成路线首先涉及从 3-氨基吡唑 1 与活化炔烃的反应中一锅两步合成 7-取代的吡唑并[1,5-a]嘧啶-5-酮。这些化合物被用作关键中间体,通过 C-O 键活化,以优异的收率获得新的 5,7-二取代吡唑并 [1,5-a] 嘧啶库,这些化合物以其广泛的生物活性而闻名用 PyBroP(溴三吡咯烷鏻六氟磷酸盐)作为活化剂。