进行了新型的4-未取代的二氢嘧啶(DPs)的合成。随后,由于在DP骨架的位置3处的区域选择性烷氧羰基化,通过位置2的活化,以优异的产率获得了在位置2具有氨基部分的各种4-未取代的1,4(3,4)-DP。使用苯肼代替胺获得3-氧代-2-苯基-2,3,5,8-四氢[1,2,4]三唑并[4,3- a ]嘧啶。根据温度和浓度,在一种衍生物的1 H NMR光谱中观察到1,4(3,4)-DP的各个互变异构体。另一方面,通过单晶X射线晶体学仅发现了固态的1,4-DP。
A General Approach to 4-unsubstituted and 4-alkyl-substituted 5-acyl-1,2,3,4-tetrahydropyrimidine-2-thiones(ones) via α-(thio)ureidoalkylation of 1,3-diketones or β-oxoesters
Oxidative Dehydrosulfurative Cross-Coupling of 3,4-Dihydropyrimidine-2-thiones with Alkynes for Access to 2-Alkynylpyrimidines
作者:Ngoc Son Le Pham、Hyunik Shin、Jun Yong Kang、Jeong-Hun Sohn
DOI:10.1021/acs.joc.0c00091
日期:2020.4.3
(DHPMs) via dehydrosulfurative Sonogashira cross-coupling with concomitant oxidative dehydrogenation using a Pd/Cu catalytic system. Together with the ready availability of DHPMs possessing various substituents at the C4–C6 positions, this transformation offers rapid and general access to diverse 2-alkynylpyrimidine derivatives.
描述了一种通过Pd / Cu催化体系通过脱硫Sonogashira交叉偶联与伴随的氧化脱氢从3,4-二氢嘧啶-1 H -2-硫酮(DHPM)一步合成2-炔基嘧啶的反应方法。连同在C4–C6位置具有各种取代基的DHPM的现成可用性,这种转变为获得各种2-炔基嘧啶衍生物提供了快速而通用的途径。
An expedient protocol of the Biginelli dihydropyrimidine synthesis using carbonyl equivalents
作者:Kamaljit Singh、Jasbir Singh、Prasant K. Deb、Harjit Singh
DOI:10.1016/s0040-4020(99)00760-7
日期:1999.10
A one - pot condensation of perhydro-1,3 heterocycles - aldehyde equivalents with ethyl acetoacetate and ureas provides a convenientsynthesis of the title compounds with a variety of substituents at C-4. Yields are equivalent or significantly higher than the conventional methods.
Synthesis, molecular docking, and cardioprotective activity of 2-methylthio-1,4-dihydropyrimidines
作者:Ramesh L. Sawant、Varsha I. Sarode、Ganesh D. Jadhav、Jyoti B. Wadekar
DOI:10.1007/s00044-011-9700-7
日期:2012.8
(IIf and IIi) was done for cardioprotective activity. Adult Sprague–dawley rats were pretreated with test compounds IIf and IIi. After the treatment period, adrenaline was subcutaneously injected to rats at an interval of 24 h for 2 days to induce myocardial injury. After 48 h, rats were anaesthetized and electrocardiographic (ECG) observations were performed. Potential compounds IIf and IIi showed significant
The Biginelli Reaction with an Imidazolium-Tagged Recyclable Iron Catalyst: Kinetics, Mechanism, and Antitumoral Activity
作者:Luciana M. Ramos、Bruna C. Guido、Catharine C. Nobrega、José R. Corrêa、Rafael G. Silva、Heibbe C. B. de Oliveira、Alexandre F. Gomes、Fábio C. Gozzo、Brenno A. D. Neto
DOI:10.1002/chem.201204314
日期:2013.3.25
The present work describes the synthesis, characterization, and application of a new ion‐tagged iron catalyst. The catalyst was employed in the Biginelli reaction with impressive performance. High yields have been achieved when the reaction was carried out in imidazolium‐based ionicliquids (BMI⋅PF6, BMI⋅NTf2, and BMI⋅BF4), thus showing that the ionic‐liquid effects play a role in the reaction. Moreover
ZIRCONIUM OXYCHLORIDE AS A NEW AND EFFICIENT CATALYST FOR THE SYNTHESIS OF 3,4-DIHYDROPYRIMIDINE-2(1H)- THIONE/ONE UNDER SOLVENT-FREE MICROWAVE IRRADIATION CONDITIONS
作者:Ch. Sanjeeva Reddy、A. Nagaraj
DOI:10.1515/hc.2007.13.1.67
日期:2007.1
Abst rac t : ZrOCl2 has been found to be an efficient catalyst for the one-pot synthesis of 3,4dihydropyrimidine-2(lH)-thione/one, from ß-ketoester, aldehyde and (thio)urea under solvent-free microwaveirradiationconditions. The beneficial effects of ZrOCl2 / microwaveirradiation on the reaction are described. This is the first report on Lewis base catalyzed Biginelli reaction.