Catalytic, enantioselective propargyl- and allenylation reactions of α-iminoester have been achieved by means of the [Cu(MeCN)4]ClO4/(R)-tol-BINAP catalyst to afford the corresponding propargyl- and allenyl-substituted α-aminoacidderivatives, respectively, in good yields with good enantiomeric excesses.
A Stereoselective Michael—Mannich Annelation Strategy for the Construction of Novel Tetrahydrocarbazoles
作者:David R. Williams、Seth A. Bawel、Richard N. Schaugaard
DOI:10.1021/acs.orglett.7b02323
日期:2017.10.6
stereoselective synthesis of tetrahydrocarbazoles. The pathway features a regio- and stereocontrolled condensation of indole and its substituted derivatives with electron-deficient 1,3-dienes via a Michael–Mannich reaction sequence. An extension of this method to include cross-conjugated allenes as substrates also results in a Michael–Mannich–Michael cascade, incorporating 2 equiv of indole with increasing