Highly diastereoselective synthesis of 1-carbamoyl-4-aminoindoloazepinone derivatives via the Ugi reaction.

A one-pot procedure for the highly diastereoselective synthesis of 1-carbamoyl-4-amino-1,2,4,5-tetrahydroindolo[2,3-c]azepin-3-one derivatives is described. Using 2-formyl-L-tryptophan as a bifunctional building block, a catalyst-free Ugi-three-component reaction (Ugi-3CR) was developed to present trisubstituted indoloazepinones in good yields and excellent diastereomeric excess.