Expedient one-pot three-component catalyst-free access to 5,6-dihydropyrimidin-4(3H)-one derivatives

NHC-Catalyzed Enantioselective [3 + 3] Annulation to Construct 5,6-Dihydropyrimidin-4-ones

The unprecedented enantioselective NHC-catalyzed [3 + 3] annulation of α-bromoenals with amidines via a dual C-N bond formation is described. The protocol allows a rapid preparation of 5,6-dihydropyrimidinones in acceptable yields with good enantioselectivities.

Modified multicomponent Biginelli–Atwal reaction towards a straightforward construction of 5,6-dihydropyrimidin-4-ones

A modified multicomponent Biginelli condensation with Meldrum's acid affords a straightforward access to 5,6-dihydropyrimidin-4-ones through a domino Knoevenagel-aza-Michael-Cyclocondensation (KaMC) reaction.