A facile approach for the synthesis of 3,4-dihydropyrimidin-2-(1H)-ones using a microwave promoted Biginelli protocol in ionic liquid
作者:ABHISHEK N DADHANIA、VAIBHAV K PATEL、DIPAK K RAVAL
DOI:10.1007/s12039-012-0278-5
日期:2012.7
recycled and reused in at least six subsequent reactions with consistent activity. Carboxy functionalized ionic liquid [cmmim][BF4] is shown to be an efficient and green catalyst for the onepotsynthesis of 3,4-dihydropyrimidin-2-(1H)-ones heterocycles under microwave irradiation. This methodology represents an easy access to Biginelli compounds with high yields and purity. The ionic liquid was recycled
A novel combination of (diacetoxyiodo)benzene and tert-butylhydroperoxide for the facile oxidative dehydrogenation of 3,4-dihydropyrimidin-2(1H)-ones
作者:Nandkishor N. Karade、Sumit V. Gampawar、Jeevan M. Kondre、Girdharilal B. Tiwari
DOI:10.1016/j.tetlet.2008.09.045
日期:2008.11
A clean and efficient oxidative dehydrogenation of 3,4-dihydropyrimidin-2(1H)-ones to 1,2-dihydropyrimidines has been achieved through a novel combination of (diacetoxyiodo)benzene and tert-butylhydroperoxide in CH2Cl2.
Regioselective chlorination at C-6 methyl position of 3,4-dihydropyrimidin-2(1H)-ones using (dichloroiodo)benzene
作者:Nilesh P. Tale、Amol V. Shelke、Bhagyashree Y. Bhong、Nandkishor N. Karade
DOI:10.1007/s00706-012-0908-0
日期:2013.7
(dichloroiodo)benzene with 4-aryl-1,2,3,4-tetrahydro-6-methyl-2-oxopyrimidine-5-carboxylates and 5-acetyl-4-aryl-3,4-dihydro-6-methylpyrimidin-2(1H)-ones resulted in geminal dichlorination at the C-6 methyl position of 3,4-dihydropyrimidin-2(1H)-one. Graphical abstract
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.
Selective N1-Alkylation of 3,4-Dihydropyrimidin-2(1<i>H</i>)-ones Using Mitsunobu-Type Conditions
作者:C. Oliver Kappe、Doris Dallinger
DOI:10.1055/s-2002-34881
日期:——
The regioselective N1-alkylation of 3,4-dihydropyrimidin-2(1H)-ones via Mitsunobu reaction is reported. Using the highly reactive Mitsunobu coupling reagent combination N,N,N′,N′-tetramethylazodicarboxamide/tributylphosphine (TMAD-TBP) and a set of primary alcohols a small library of N1-alkylated dihydropyrimidones is obtained in good to excellent yields.