Aziridine-derived iminophosphine ligands in palladium-catalyzed allylic substitution
摘要:
New iminophosphines have been synthesized from (R,R)-1-amino-2-diphenylphosphino cyclohexane (R.R)-1 in good to excellent yields. The catalysts obtained from iminophosphines 3a-g and [Pd(C3H5)Cl](2) promote the enantioselective allylic substitution of 1,3-diphenyl-2-propenyl acetate (6) with diethyl malonate with good enantioselectivity. The air-stable complex PdCl2[K-2-P,N-(R,R)-2-Ph2PC6H10N=CHPh] (4) has been prepared and structurally characterized by X-ray crystallography. (C) 2004 Elsevier B.V. All rights reserved.