Synthesis, study of the structure, and modification of the products of the reaction of 4-aryl-4-oxobut-2-enoic acids with thiourea
作者:Nadezhda N. Kolos、Nikolai V. Nazarenko、Svetlana V. Shishkina、Andrey O. Doroshenko、Elena G. Shvets、Maksim A. Kolosov、Fedor G. Yaremenko
DOI:10.1007/s10593-020-02798-y
日期:2020.9
A number of previously undescribed derivatives of 2-amino-5-(2-aryl-2-oxoethyl)thiazol-4(5H)-one containing electron-donating substituents in the aromatic ring were synthesized by the reaction of (E)-4-aryl-4-oxobut-2-enoic acids with thiourea. Reduction of the reaction products with NaBH4 yielded diastereomeric alcohols, whereas bromination in AcOH was accompanied by elimination of HBr and the formation
Efficient Synthesis of Uracil-Derived Hexa- and Tetrahydropyrido[2,3-<i>d</i>]pyrimidines
作者:Nikita Tolstoluzhsky、Pavlo Nikolaienko、Nikolay Gorobets、Erik V. Van der Eycken、Nadezhda Kolos
DOI:10.1002/ejoc.201300683
日期:2013.8
esters leads to hexahydropyrido[2,3-d]pyrimidine-5-carboxylic acids or the corresponding methyl esters in high to excellent yields. One-pot oxidation of the acid derivatives with CAN is accompanied by decarboxylation to give tetrahydropyrido[2,3-d]pyrimidines, while oxidation with bromine resulted in the formation of tetrahydropyrido[2,3-d]pyrimidine-5-carboxylic acids. The aromatization of methyl hexahydropyrido[2
6-氨基-1,3-二甲基尿嘧啶与 3-(杂)芳酰基丙烯酸及其甲酯的反应生成六氢吡啶并[2,3-d]嘧啶-5-羧酸或相应的甲酯,收率高至极好. 酸衍生物用 CAN 的一锅氧化伴随着脱羧作用得到四氢吡啶并[2,3-d]嘧啶,而用溴氧化导致形成四氢吡啶并[2,3-d]嘧啶-5-羧酸。在环境条件下通过 K2CO3 介导的空气氧化实现了甲基六氢吡啶并 [2,3-d]pyrimidine-5-carboxylates 的芳构化。