Synthesis of 2-substituted pyrimidines and benzoxazoles via a visible-light-driven organocatalytic aerobic oxidation: enhancement of the reaction rate and selectivity by a base
作者:Lin Wang、Zhi-Gang Ma、Xiao-Jing Wei、Qing-Yuan Meng、Deng-Tao Yang、Shao-Fu Du、Zi-Fei Chen、Li-Zhu Wu、Qiang Liu
DOI:10.1039/c4gc00337c
日期:——
An efficient visible-light-driven photocatalytic oxidation of various 2-substituted dihydropyrimidines and phenolic imines has been achieved using an organic photocatalyst eosin Y bis(tetrabutyl ammonium salt) (TBA-eosin Y) and inexpensive oxidant molecular oxygen. With the aid of a base, significantly enhanced photoinduced electron transfer from substrates dihydropyrimidines or phenolic imines to the excited state of TBA-eosin Y has enabled the aerobic oxidation to yield 2-(methylthio)pyrimidines or 2-arylbenzoxazoles selectively.
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
Reactions With Hydrazonoyl Halides 45: Synthesis of Some New Triazolino[4,3‐<i>a</i>]pyrimidines, Pyrazolo[3,4‐<i>d</i>]pyridazines, Isoxazolo[3,4‐<i>d</i>]pyridazines, and Thieno[2,3‐<i>b</i>]pyridines
作者:Abdou O. Abdelhamid、Ali A. Al‐Atoom
DOI:10.1080/00397910500330593
日期:2006.2
Abstract Triazolino[4,3‐a]pyrimidines pyrazolo[3,4‐d]pyridazines and isoxazolo[3,4‐d]pyridazines were synthesized from hydrazonoylhalides. Also, 3‐aminothieno[2,3‐b]pyridines and pyrimidino[4′,5′:4,5]thieno[2,3‐b]pyridines were synthesized from cynothioacetamide. Structures of the newly synthesized compounds were established on the basis of elemental analyses and spectral data.
Reduction of Biginelli compounds by LiAlH<sub>4</sub>: a rapid access to molecular diversity
作者:Dragan B. Zlatković、Niko S. Radulović
DOI:10.1039/c6ra24535h
日期:——
obtained alcohols could be readily dehydrated to vicinalbis(exo-methylene) derivatives (4-aryl-1-methyl-5-(m)ethylene-6-methylene-tetrahydropyrimidin-2(1H)-ones; 4 examples) or isomerized to acyclic compounds (1-methyl-3-(1-aryl-2-methylene-3-oxobutyl)ureas; 2 examples) under mildly acidic conditions. The outcome of the reduction also depended on other structural features and reaction conditions such as: