Highly enantioselective Biginelli reaction using sulfonic-functionalized chiral hyperbranched polylysine in absence of solvent: A new catalyst for asymmetric synthesis of dihydropyrimidinones
In summary, this paper describes synthesis of a new acidic catalyst to accomplish highly enantioselective Biginelli reactions. Sulfonic-functionalized hyperbranched polylysine (HBPL-SO3H) as a novel and efficient catalyst help synthesize a series of optically active dihydropyrimidinones via asymmetric synthesis. The reactions carried out under solvent-free conditions at 70 °C within 7 h and produced