A One-Pot Synthesis of 3,4-Dihydropyrimidin-2-(1H)-ones from Primary Alcohols Promoted by Bi(NO3)3·5H2O in Two Different Media: Organic Solvent and Ionic Liquid
作者:Ahmad Reza Khosropour、Ahmad R. Khosropour、Mohammd M. Khodaei、Mojtaba Beygzadeh、Mahbubeh Jokar
DOI:10.3987/com-04-10257
日期:——
A new, simple and efficientprocedure for the one-pot conversion of alcohols instead of aldehydes to the corresponding 3,4-dihydropyrimidin-2(1H)-ones (DHPMs) with Bi(NO 3 ) 3 .5H 2 O as a commercially available, inexpensive, stable and non-toxic reagent in two media, acetonitrile (as an organic solvent) and tetrabutylammonium bromide (as an ionic liquid) is described. This one-pot oxidation-cyclocondensation
Aluminium Nitrate Nonahydrate (Al(NO3)3⋅9 H2O): An Efficient Oxidant Catalyst for the One-Pot Synthesis of Biginelli Compounds from Benzyl Alcohols
作者:Eskandar Kolvari、Mohammad Ali Zolfigol、Maryam Mirzaeean
DOI:10.1002/hlca.201100242
日期:2012.1
A clean and efficient tandem oxidative cyclocondensation process is reported for the synthesis of 3,4‐dihydropyrimidin‐2(1H)‐one or ‐thione derivatives from primary aryl alcohols, β‐keto esters, and urea or thiourea in the presence of Al(NO3)3⋅9H2O as oxidantcatalyst (Scheme, Table 5).
environmentally friendly reaction conditions. Keywords: Dihydropyrimidinone, Dihydropyrimidinthione, Cobalt(II)Nitrate, Solvent-free, One-potsynthesis INTRODUCTION Synthesis of 3,4-dihydropyrimidine-2(1H)-Ones (DHPMs) through one-pot reaction of aromatic aldehyde, urea and ethyl acetoacetate in acid ethanol solution was initiated by Biginelli in 1893 1 . These compounds occupied an important place in medicinal
Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones Using Ce(SO<sub>4</sub>)<sub>2</sub>-SiO<sub>2</sub>as a Heterogeneous and Recyclable Catalyst
作者:Wen Pei、Qin Wang
DOI:10.1080/00397910903061076
日期:2010.3.19
A simple and efficientsynthesis of 3,4-dihydropyrimidinones or thiones is described, using silica-supported ceric sulfate [Ce(SO4)2-SiO2] as a heterogeneouscatalyst from an aldehyde, 1,3-dicarbonyl compound, and urea or thiourea at 110 °C under solvent-free conditions. Compared with the classical Biginelli reaction, this new method consistently has better yields, short reaction time, easy separation
描述了一种简单有效的 3,4-二氢嘧啶酮或硫酮合成方法,使用二氧化硅负载的硫酸铈 [Ce(SO4)2-SiO2] 作为来自醛、1,3-二羰基化合物和尿素或硫脲的非均相催化剂在 110 °C 无溶剂条件下。与经典的 Biginelli 反应相比,这种新方法始终具有更高的产率、更短的反应时间、易于分离以及对各种官能团的耐受性。