Biomimetic asymmetric reduction of benzoxazinones and quinoxalinones using ureas as transfer catalysts

Using ureas as transfer catalysts through hydrogen bonding activation, biomimetic asymmetric reduction of benzoxazinones and quinoxalinones has been developed, giving chiral products with high enantioselectivities. A key dihydroquinoxalinone intermediate of a BRD4 inhibitor was synthesized using biomimetic asymmetric reduction.