Zr(HSO<sub>4</sub>)<sub>4</sub>/SiO<sub>2</sub> as an Efficient Alternative Catalyst for the Claisen-Schmidt Condensation
作者:Bi Bi Fatemeh Mirjalilia、Abddhamid Bamoniri、Masoumeh Alipour、Mohammad Ali Karimi Zarchia
DOI:10.1515/znb-2008-1213
日期:2008.12.1
Zr(HSO4)4/SiO2 promotes the regio-, stereo- and chemoselectiveClaisen-Schmidtcondensation of aromatic aldehydes with ketones under solvent-free conditions with improved yields. The work-up of the reaction mixture is simple, and the catalyst is easily removed from the products by simple filtration.
Nucleic Acid Components and Their Analogues: New Synthesis of Bicyclic Thiopyrimidine Nucleosides
作者:Galal E. H. Elgemeie、Adel M. E. Attia、Sherifa S. Alkabai
DOI:10.1080/15257770008035020
日期:2000.4
Abstract A novel synthesis of condensed bicyclic thiopyrimidine glycosides utilising 1H-cyclopentapyrimidine-2(3H)-thiones and α-bromoglucose or α-bromogalactose tetraacetate as starting components is described.
Ananthakrishna Nadar; Renuga, Journal of the Indian Chemical Society, 2006, vol. 83, # 12, p. 1219 - 1222
作者:Ananthakrishna Nadar、Renuga
DOI:——
日期:——
Kierstead et al., Journal of the Chemical Society, 1952, p. 3616,3619
作者:Kierstead et al.
DOI:——
日期:——
Bi-functional modified-phosphate catalyzed the synthesis of α-α′-(EE)-bis(benzylidene)-cycloalkanones: Microwave versus conventional-heating
作者:Abderrahim Solhy、Walid Amer、Mohamed Karkouri、Rachid Tahir、Abdeslam El Bouari、Aziz Fihri、Mostapha Bousmina、Mohamed Zahouily
DOI:10.1016/j.molcata.2010.11.032
日期:2011.2
The impregnation of hydroxyapatite (HAP) by NaNO3 leads to a modified-hydroxyapatite which has a bi-functional acid-base property. Sodium-modified-hydroxyapatite (Na-HAP) efficiently catalyzed the cross-aldol condensation of arylaldehydes and cycloketones to afford alpha-alpha'-(EE)-bis(benzylidene)cycloalkanones in good yields under microwave irradiation. Moreover, the methodology described in this paper provides a very easy and efficient synthesis carried out in water as the greenest available solvent under conventional heating. A comparison study between these two different modes of heating was ;investigated. The catalyst was easily recovered and efficiently re-used. (C) 2010 Elsevier B.V. All rights reserved.