Palladium catalysed addition–substitution reaction of pronucleophiles with allenylstannanes and prop-2-ynylstannanes
摘要:
The palladium catalysed reactions of pronucleophiles 1 with allenylstannanes 2 or prop-2-ynylstannanes 3 give the corresponding addition-substitution products 4 in reasonable to high yields; this double alkylation reaction most probably proceeds through an allylstannane intermediate.
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.