An Efficacious Protocol for the Oxidation of 3,4-Dihydropyrimidin-2(1H)-ones using Pyridinium Chlorochromate as Catalyst
作者:Kamaljit Singh、Kawaljit Singh
DOI:10.1071/ch07432
日期:——
4-Unsubstituted as well as 4,6-aryl/alkyl-3,4-dihydropyrimidin-2(1H)-ones were oxidized under neutral conditions using pyridinium chlorochromate to obtain the corresponding pyrimidin-2(1H)-ones in a synthetically useful manner.
An Efficacious Protocol for 4-Substituted 3,4-Dihydropyrimidinones: Synthesis and Calcium Channel Binding Studies
作者:Kamaljit Singh、Divya Arora、Danielle Falkowski、Qingxin Liu、Robert S. Moreland
DOI:10.1002/ejoc.200900208
日期:2009.7
anion of enantiopure chiral auxiliary (1R,2S,5R)-(-)-methyl (S)-p-toluenesulfinate to afford C-4 substituted and enantiopure congeners of medicinally potent Biginelli dihydropyrimidinones. The calciumchannel blocking activity of some of the compounds was evaluated and compared with nifedipine for their ability to relax a membrane depolarization induced contraction.
A highly regio- and chemoselective addition of carbon nucleophiles to pyrimidinones. A new route to C4 elaborated Biginelli compounds
作者:Kamaljit Singh、Divya Arora、Sukhdeep Singh
DOI:10.1016/j.tetlet.2006.12.111
日期:2007.2
Ethyl 6-methyl-pyrimidine-2-one-5-carboxylates react with C-nucleophiles in a diversity oriented synthetic sequence to afford C4 substituted congeners of medicinally potent Biginelli dihydropyrimidinones, in a highly regioselective manner. (c) 2006 Elsevier Ltd. All rights reserved.
Highly Regioselective Addition of Organozinc Reagents to 2-Oxo-1,2-dihydropyrimidine-5-carboxylates Activated by BF<sub>3</sub>·OEt<sub>2</sub>: Synthesis of 2-Oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylates
作者:Kamaljit Singh、Rakesh Chopra
DOI:10.1002/ejoc.201300539
日期:2013.9
The incorporation of alkyl as well as phenyl groups at C-4, a key position of 2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylates, responsible for antagonist/agonist switching of the calcium channel blocking activity of these compounds, has been achieved by the addition of organozincreagents to the corresponding 2-oxo-1,2-dihydropyrimidine-5-carboxylate derivatives catalysed by BF3OEt2.