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.
preparation of functionalized 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid derivatives by a cycloaddition strategy is described. The synthesis of various enyne building blocks 12, 13, 21, and 22 containing an α-amino acid moiety using Schiff base 8 as a glycine equivalent has been achieved under mild reaction conditions. These building blocks have been utilized in the synthesis of inner-outer ring dienes