Highly enantioselective Biginelli reaction catalyzed by SPINOL-phosphoric acids
作者:Fangxi Xu、Dan Huang、Xufeng Lin、Yanguang Wang
DOI:10.1039/c2ob25663k
日期:——
A highlyenantioselectiveBiginellireaction promoted by chiral spirocyclic SPINOL-phosphoric acids has been developed. Under the optimized conditions with 5 mol% catalyst loading, a wide range of optically active dihydropyrimidinethiones (DHPMs) were obtained in high yields (up to 98%) with good to excellent enantioselectivities (up to 99% ee). The synthetic utility of this method was demonstrated
Doubleaxiallychiralbisphosphorylimides have been used as catalysts in enantioselectiveBiginellireactions. The three-component reaction of aromatic aldehydes, thiourea, and ethyl acetoacetate took place by using 5 mol-% catalyst in ethyl acetate at 50 °C. A series of chiral dihydropyrimidinethiones (DHPMs) were obtained in high yields (up to 97 %) with good to high enantioselectivities (up to 96 % ee)
Synthesis of a novel sterically hindered chiral cyclic phosphoric acid derived from l-tartaric acid and application to the asymmetric catalytic Biginelli reaction
A novel sterically hindered chiral cyclic phosphoric acid derived from L-tartaric acid was designed and synthesized based on highly regioselective cyclosulfitation of chiral 1,1,4,4-tetraphenylbutanetetraol. The asymmetric Biginelli reaction catalyzed by this newly synthesized chiral phosphoric acid was examined, and enantioselectivities up to 99% ee was obtained. (C) 2016 Elsevier Ltd. All rights reserved.