Vinylation of α-Aminoazoles with Triethylamine: A General Strategy to Construct Azolo[1,5-<i>a</i>]pyrimidines with a Nonsubstituted Ethylidene Fragment
作者:Qinghe Gao、Zhenhua Sun、Qinfei Xia、Ruonan Li、Wenlong Wang、Siwei Ma、Yixin Chai、Manman Wu、Wei Hu、Péter Ábrányi-Balogh、György M. Keserű、Xinya Han
DOI:10.1021/acs.orglett.1c00571
日期:2021.4.2
A new general synthesis of pharmaceutically important azolo[1,5-a]pyrimidines starting from widely available 3(5)-aminoazoles, aldehydes, and triethylamine is developed. The key is to enable the vinylation reaction that allows the in situ generation of elusive acyclic enamines and the subsequent annulation reaction to occur. This direct and practical strategy is capable of constructing a range of 5
从广泛可用的3(5)-氨基唑,醛和三乙胺开始,开发了一种重要的药学上重要的偶氮[1,5- a ]嘧啶的新的一般合成方法。关键是要实现乙烯基化反应,该反应可以原位产生难以捉摸的无环烯胺,并随后发生环化反应。这种直接而实用的策略能够构建一系列5,6-未取代的吡唑并[1,5- a ]嘧啶和[1,2,4]三唑并[1,5- a ]嘧啶。更重要的是,该方案为制备临床使用的扎来普隆提供了一种简明的合成途径。
Synthesis of New [1,2,4]Triazolo[1,5-<i>a</i>
]pyrimidine Derivatives: Reactivity of 3-Amino[1,2,4]triazole towards Enaminonitriles and Enaminones
作者:Abdulaziz Alnajjar、Mervat Mohammed Abdelkhalik、Mohamed Abdelmonem Raslan、Solwan Maher Ibraheem、Kamal Usef Sadek
DOI:10.1002/jhet.3222
日期:2018.7
A diversity of new 7‐substituted[1,2,4]triazolo[1,5‐a]pyrimidine and 6‐substituted[1,2,4]triazolo[1,5‐a]pyrimidine‐7‐amine derivatives has been synthesized via reaction of 3‐amino‐[1,2,4]triazole with enaminonitriles and enaminones. The regio orientation and the structure of the products were confirmed by spectral and analytical data and synthesis via an alternative route. The procedure proved to be
已经开发了多种新的7-取代的[1,2,4]三唑[1,5- a ]嘧啶和6-取代的[1,2,4]三唑[1,5 - a ]嘧啶-7-胺衍生物通过3-氨基[1,2,4]三唑与烯胺腈和烯胺酮的反应合成。产物的区域取向和结构通过光谱和分析数据以及通过另一种途径的合成得到证实。该方法被证明是简单,有效和高收率的,并且获得了[1,2,4]三唑并[1,5- a ]嘧啶的多样性。
Studies with enaminones: The reaction of enaminones with aminoheterocycles. A route to azolopyrimidines, azolopyridines and quinolines
作者:Sarah Almazroa、Mohamed H. Elnagdi、Abdellatif M. Salah El-Din
DOI:10.1002/jhet.5570410219
日期:2004.3
e resulted in its trimerisation and only triaroylbenzene 8a,d,e was isolated. The reaction of 1a,b,d with anthranilonitrile 9a and the reaction of 1a-c with the 2-aminocyclohexene thiophene-3-nitrile 10a afforded the cis enaminones 11a-c and 12a-c. Similarly, reaction of 1a-c with the methylanthranilate 9b and reaction of 1b,e with ethyl 2-aminocyclohexene thiophene-3-carboxylate 10b afforded the cis
烯胺酮1b,d,f与4-苯基-3-甲基-5-吡唑胺3a反应,生成吡唑衍生物4a-c,该吡唑衍生物在盐酸存在下于吡啶溶液中回流时易于环化,从而生成吡唑并[1,5] -一个]嘧啶5A-C。类似地,3(5)-氨基-1 H-三唑(3b)与1b,d,f反应,产生三唑并[1,5 - a ]嘧啶5d-f。相反,尝试将5-四唑胺(3c)与1a,d,e缩合会导致其三聚,只有三芳酰苯8a,d,e被隔离了。的反应1A,B,d与氨基苯甲腈9A和的反应1A-1C与2 aminocyclohexene噻吩-3-腈10A,得到顺式烯胺酮11A-C和12A-C。类似地,1a-c与甲基邻氨基苯甲酸甲酯9b的反应和1b,e与2-氨基环己烯噻吩-3-羧酸乙酯10b的反应分别得到顺式烯胺酮11d-f和12d,e。尝试环化11a-c变成喹啉失败。在家用微波炉中以全功率加热5分钟后,可能会影响11d成功环化成喹啉酮13。1a-c,f
Ultrasound irradiation promotes the synthesis of new 1,2,4-triazolo[1,5-a]pyrimidine
作者:Clarissa P. Frizzo、Elisandra Scapin、Mara R.B. Marzari、Taiana S. München、Nilo Zanatta、Helio G. Bonacorso、Lilian Buriol、Marcos A.P. Martins
DOI:10.1016/j.ultsonch.2013.12.007
日期:2014.5
Ultrasonic irradiation was used in the synthesis of a series of novel 1,2,4-triazolo[1,5-a]pyrimidines. The products were synthetized from the cyclocondensation reaction of 1,1,1-trifluoro-4-metoxy-3-alken-2-one [CF3C(O)CHC(R)OMe, where R=Ph, 4-F-C6H4, 4-Br-C6H4, 4-I-C6H4, 4-CH3-C6H4, 4-CH3O-C6H4, Thien-2-yl, Biphen-4-yl] or β-enaminones [RC(O)CHCHNMe2, where R=Ph, 4-F-C6H4, 4-Br-C6H4, 4-I-C6H4, 4-CH3-C6H4