A catalyst- and solvent-free three-component reaction for the regioselective one-pot access to polyfunctionalized pyrroles
作者:Subrahmanya Ishwar Bhat、Darshak R. Trivedi
DOI:10.1016/j.tetlet.2013.07.153
日期:2013.10
A facile method for the regioselectivesynthesis of tetrasubstituted pyrroles, from readily accessible 1,3-dicarbonyls, benzoin derivatives and ammonium acetate, has been developed. The one-potthree-component reactions were performed to afford tetrasubstituted pyrroles under solvent- and catalyst-freeconditions.
Cocamidopropyl Betaine Catalyzed Benzoin Condensation and Pseudo-Four-Component Reaction of the in Situ Formed Benzoin in Water
作者:Fatemeh Tamaddon、Masoomeh Alizadeh
DOI:10.1055/s-0034-1379881
日期:——
An improved synthesis of benzoins, as key synthetic building blocks, and substituted pyrroles in micelle medium using a very small amount of cocamidopropyl betaine in water is described. In this one-pot strategy, benzoin condensation of aldehydes and further pseudo-four-component reaction of the in situ formed benzoin with 1,3-dicarbonyls, and ammonium acetate gave excellent yields of the desired pyrrole
An efficient nickel-catalyzed formal [3 + 2]-cycloaddition of 2H-azirines with 1,3-dicarbonylcompounds for the synthesis of tetrasubstituted pyrroles has been developed. This transformation involves cleavage of the CN double bond and the construction of new CC and CN bonds. The reaction employs readily available starting materials, tolerates a wide range of functional groups, and affords tetrasubstituted
pyrroles were synthesized via three-component condensation reaction of benzoin derivatives, 1,3-dicarbonyl compounds, and ammoniumacetate using acidic Al2O3 as an efficient and reusable heterogeneous catalyst in refluxing ethanol in high yields. Also, acidic alumina was catalyzed 1,4-dihydro-tetraarylpyrazines by the condensation reaction of benzoins and ammoniumacetate in refluxing ethanol in high
摘要利用酸性Al 2 O 3作为高效可重复使用的多相催化剂,通过苯偶姻衍生物,1,3-二羰基化合物和乙酸铵的三组分缩合反应,合成了一些新的2,3,4,5-四取代的吡咯。高产。同样,通过苯甲酸酯和乙酸铵在回流的乙醇中的缩合反应,可以高产率地催化酸性氧化铝催化1,4-二氢-四芳基吡嗪。当用于连续反应运行时,氧化铝显示出几乎相同的效率。 图形概要酸性氧化铝用作非均相酸性催化剂,用于在回流的乙醇中合成四取代的吡咯。催化剂可以循环使用几次。
Molybdate sulfuric acid as a reusable solid catalyst in the synthesis of 2,3,4,5-tetrasubstituted pyrroles via a new one-pot [2+2+1] strategy
作者:Fatemeh Tamaddon、Mahnaz Farahi、Bahador Karami
DOI:10.1016/j.molcata.2012.01.003
日期:2012.4
Molybdatesulfuricacid (MSA) has been found as an efficient and reusable solid acid catalyst for the synthesis of new 2,3,4,5-tetrasubstituted pyrroles via a novel [2+2+1] strategy. Thus, one-pot three-component reaction of benzoin derivatives, 1,3-dicarbonyls, and ammonium acetate afforded the desired products in high yield under solvent-free conditions.