Highly Enantioselective Synthesis of Atropisomeric Anilide Derivatives through Catalytic Asymmetric N-Arylation: Conformational Analysis and Application to Asymmetric Enolate Chemistry
enantioselectivity (88-96% ee) to give atropisomeric N-(p-nitrophenyl)anilides having an N-C chiral axis in good yields. Atropisomeric anilide products highly prefer to exist as the E-rotamer which has trans-disposed o-tert-butylphenyl group and carbonyl oxygen. The application of the present catalytic enantioselective N-arylation to an intramolecular version gives atropisomeric lactam derivatives with high
of (R)-DTBM-SEGPHOS-Pd(OAc)2 catalyst, N-arylation of ortho-tert-butyl-NH-anilides with 4-nitroiodobenzene proceeds with high enantioselectivity (89-95% ee) to give optically active atropisomeric anilides possessing N-C chiral axis. Furthermore, the intramolecular version of the present catalytic asymmetric N-arylation gave atropisomeric lactams with high optical purity (94-96% ee).
N-Allylation of o-tert-butyl anilides derived from o-tert-butyl aniline and (S)-lactic acid or (S)-mandelic acid proceeded with high diastereoselectivity in the presence of a (BINAP)Pd-pi-allyl catalyst to give atropisomeric N-allyl o-tert-butyl anilide derivatives.