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chemistry
1. Silica Boron Sulfonic Acid as Heterogeneous and Highly Efficient Solid Acid Catalyst For the Preparation of Hantzsch 1,4-dihydropyridines Under Solvent-Free

sami sajjadifar; Pegah Masoudi

Volume 30, Issue 1 , Winter 2019, , Pages 33-40

http://dx.doi.org/10.22059/jsciences.2019.69630

Abstract
  Silica boron sulfonic acid [SiO2–B(OSO3H)3] as an inexpensive, reusable, and Lewis and Brønsted acid catalyst was successfully synthesized, and used for the one-pot three-components synthesis of biologically active substituted Hantzsch 1,4-dihydropyridine derivatives  in the absence ...  Read More

2. An Efficient, Three-Component Synthesis of 3,4-Di Hydropyrimidin-2(1H)-Ones Using LaCl3/ClCH2COOH as Environmentally Benign and Green Catalytic System

B. Pouramiri; E. Tavakolinejad Kermany; H. Khajesamani; H. Khabazzadeh

Volume 25, Issue 4 , Autumn 2014, , Pages 323-327

Abstract
  An improved, simple, and facile synthesis of 3,4-dihydropyrimidin-2(1H)-ones by employing three-component, one-pot condensation reaction of β-keto ester, aromatic aldehydes, and urea or N-methylurea using LaCl3/ClCH2COOH as an inexpensive and green chemistry catalyst system under solvent-free conditions ...  Read More