A phosphorus-containing chiral amidine ligand for asymmetric reactions: enantioselective Pd-catalyzed allylic alkylation
摘要:
Phosphorus-containing amidine 7 was prepared through several steps from L-valine 1. The new ligand for asymmetric reactions was evaluated in the palladium-catalyzed allylic alkylation of 1, 3-diphenylprop-2-enyl acetate and pivalate 8a, b with the nucleophile derived from dimethyl malonate as a preliminary study. Excellent levels of asymmetric induction up to 95% e.e. were achieved along with an efficient conversion. (C) 1997 Elsevier Science Ltd.