Pd-Catalyzed One-Pot Borylation/Intramolecular Asymmetric Arylation on alpha-Ketiminoamides: Innovative Approach to Chiral 3-Amino-2-oxindoles

摘要

3-Amino-2-oxindole derivatives are a common framework found in many natural products and medicinal compounds and thus their synthesis is of significant importance. We report for the first time a one-pot approach for the synthesis of these compounds, using a borylation/intramolecular asymmetric arylation sequence starting from ortho-bromo-alpha-ketimino amide derivatives. Pd(OAc)(2) was used as the pre-catalyst along with (R)-BINAP as the chiral source. We successfully obtained a family of 3-phenyl-3-(aryl-amino)-indolin-2-one derivatives (11 in total) with excellent yields (up to 98%) and enantioselectivities of up to 76% ee. The reaction is versatile and tolerant of a wide range of functional groups.