通过两种途径合成6-未取代的7-R-4,7-二氢-1,2,4-三唑并[1,5- a ]嘧啶(R = H或Me):(a)相应的5-脱酰基KOH / H 2 O中的乙酰基Biginelli状前体,以及(b)使用LiAlH 4还原相应的1,2,4-三唑并[1,5- a ]嘧啶。产物可以容易地在位置6处被甲酰化,这对于进一步合成4,7-二氢-1,2,4-三唑并[1,5- a ]嘧啶的官能化的6-取代的衍生物是有希望的。相反,6-乙酰基-7-(4-(N,N-二甲基氨基苯基))-5-甲基-4,7-二氢-1,2,4-三唑并[1,5- a ]嘧啶经历级联过程在KOH / H 2中O,导致形成4,5,8,9-四氢[1,2,4]三唑并[5,1- b ]喹唑啉衍生物。
通过两种途径合成6-未取代的7-R-4,7-二氢-1,2,4-三唑并[1,5- a ]嘧啶(R = H或Me):(a)相应的5-脱酰基KOH / H 2 O中的乙酰基Biginelli状前体,以及(b)使用LiAlH 4还原相应的1,2,4-三唑并[1,5- a ]嘧啶。产物可以容易地在位置6处被甲酰化,这对于进一步合成4,7-二氢-1,2,4-三唑并[1,5- a ]嘧啶的官能化的6-取代的衍生物是有希望的。相反,6-乙酰基-7-(4-(N,N-二甲基氨基苯基))-5-甲基-4,7-二氢-1,2,4-三唑并[1,5- a ]嘧啶经历级联过程在KOH / H 2中O,导致形成4,5,8,9-四氢[1,2,4]三唑并[5,1- b ]喹唑啉衍生物。
Three-Component Uncatalyzed Eco-Friendly Reactions for One-Pot Synthesis of 4,7-Dihydro[1,2,4]triazolo[1,5-<i>a</i>]pyrimidine Derivatives
作者:Eman A. El Rady
DOI:10.1002/jhet.1771
日期:2014.5
A three‐component system of one‐pot synthesis of [1,2,4]triazolo[1,5‐a]pyrimidinederivatives using condensation of 1,3‐dicarbonyl compounds, aldehydes, and 5‐amino[1,2,4]triazole in ethanol without any catalyst was reported in high yields via simple, efficient, and environmentally friendly process. The method reported herein considered a green process; this method has significant advantages of simple
一种三组分系统,可通过1,3-二羰基化合物,醛和5-氨基[1,2,4]的缩合一锅合成[1,2,4]三唑并[1,5- a ]嘧啶衍生物据报道,通过简单,有效和环保的方法,乙醇中无]]三唑的收率很高。本文报道的方法被认为是绿色工艺。与传统报道的方法相比,该方法具有以下优点:后处理步骤简单,产率极佳,对环境的污染最小,反应时间短。
A synthesis of 6-functionalized 7-unsubstituted- and 7-methyl[1,2,4]azolo[1,5-<i>a</i>]pyrimidine derivatives
作者:Maksim A. Kolosov、Elena H. Shvets、Dmitriy A. Manuenkov、Olesia G. Kulyk、Alexander V. Mazepa、Valeriy D. Orlov
DOI:10.1080/00397911.2019.1566476
日期:2019.2.16
2,4]azolo[1,5-a]pyrimidines (R = H or Me) were synthesized by Biginelli-like reaction of formaldehyde or acetaldehyde, aminoazoles, and corresponding β-dicarbonyl precursor. Alkylation of the obtained compounds proceeds smoothly at position 4, while oxidation leads to 7-R-[1,2,4]azolo[1,5-a]pyrimidines formation. 6-Ethoxycarbonyl derivatives could be reduced to the corresponding alcohols by LiAlH4 and
Acetic aldehyde in multicomponent synthesis of azolopyrimidine derivatives in water
作者:Irina G. Tkachenko、Sergey A. Komykhov、Eugene S. Gladkov、Vladimir I. Musatov、Valentyn A. Chebanov、Sergey M. Desenko
DOI:10.1007/s10593-019-02470-0
日期:2019.5
Three-component reaction of 3-amino-1H-1,2,4-triazole or 5-amino-2H-1,2,3-triazole derivatives, acetaldehyde, and 1,3-dicarbonylcompounds (acetylacetone or β-keto esters) in waterundermicrowaveirradiation leads to regioselective formation of 4,7-dihydro[1,2,4]-triazolo- and 4,7-dihydro[1,2,3]triazolo[1,5-a]pyrimidines. Using ethyl 4,4,4-trifluoro-3-oxobutanoate as 1,3-dicarbonylcompoundunder the same