结构上已表征了六个带有7-三氟甲基(三个化合物),7-三氯甲基(两个化合物)和7-乙氧羰基(一个化合物)的吡唑并[1,5- a ]嘧啶。2-甲基-5-(对溴苯基)-7-三氟甲基吡唑并[1,5- a ]嘧啶(3)和2-甲基-7-三氯甲基吡唑并[1,5- a ]嘧啶(4)被报道。溶液和固态下GIAO / B3LYP / 6-311 ++ G(d,p)计算与NMR光谱的组合使用可以建立一些可用于表征相关化合物的一般规则。化合物3和4存在于固态有趣的分子内和分子间卤素键中。J.杂环化学。(2010)。
Resourceful synthesis of pyrazolo[1,5-a]pyrimidines under ultrasound irradiation
作者:Lilian Buriol、Taiana S. München、Clarissa P. Frizzo、Mara R.B. Marzari、Nilo Zanatta、Helio G. Bonacorso、Marcos A.P. Martins
DOI:10.1016/j.ultsonch.2013.02.006
日期:2013.9
Pyrazolo[1,5-a]pyrimidines were synthesized via the ultrasonic sonochemical method using the cyclo-condensation reaction of 4-alkoxy-1,1,1-trifluoro-3-alken-2-ones [CF3(C)(O)CH = C(R)(OMe) - where R = Me, Bu, i-Bu, Ph, 4-Me-C6H4, 4-F-C6H4, 4-CI-C6H4, 4-Br-C6H4, naphth-2-yl and biphen-4-yl] - with 3-amino-5-methyl-1H-pyrazole in the presence of EtOH for 5 min. This methodology has several advantages, for example, it is a simple procedure, it has an easy work-up, Mild conditions, short reaction times (5 min) and produces satisfactory yields (61-98%). (C) 2013 Elsevier B.V. All rights reserved.