Asymmetric palladium-catalyzed benzylic nucleophilic substitution: high enantioselectivity with the DUPHOS family ligands
摘要:
The asymmetric palladium-catalyzed benzylic reaction of 1-(2-naphthyl)ethyl acetate and its 6-methoxy substituted analogue with dimethyl malonate anion led to substitution products with up to 90% ee when the iPr-DUPHOS chiral ligand was used. (C) 2005 Elsevier Ltd. All rights reserved.
Palladium-catalyzed substitution of esters of naphthylmethanols, 1-naphthylethanols, and analogues by sodium dimethyl malonate. Stereoselective synthesis from enantiomerically pure substrates
The palladium-catalyzed substitution of carbonates of the titled alcohols was performed at lower temperature than the previously reported reaction of the corresponding acetates. The use of enantiomericallypure carbonates gave substitution products with overall retention of the configuration (up to 97%).
Palladium-Catalyzed Asymmetric Benzylic Alkylation of Active Methylene Compounds with α-Naphthylbenzyl Carbonates and Pivalates
作者:Sho Tabuchi、Koji Hirano、Masahiro Miura
DOI:10.1002/anie.201602075
日期:2016.6.6
Pd/(R)‐H8‐BINAP‐catalyzed asymmetric benzylic alkylation of active methylene compounds has been developed. The reaction proceeds without the use of an external base, and the starting racemic diarylmethyl carbonates are converted into the optically active coupling products which contain the benzylic chiral stereocenter by a dynamickineticasymmetrictransformation (DYKAT). Additionally, with suitable
Naphthylmethyl acetates 1a and 2a were substituted by morpholine in DMPU in the presence of 2 mol% of [Pd(dba)(2) + 15 dppe] to give products 9-10 in 66-70% isolated yield. In DMF in the presence of benzylamine, N,N-dimethylnaphthylmethylamines 11-12 were produced in 78-85% isolated yield. Copyright (C) 1996 Elsevier Science Ltd
Palladium-catalyzed nucleophilic substitution of napht hylmethyl and 1-naphthylethyl esters
作者:Jean-Yves Legros、Jean-Claude Fiaud
DOI:10.1016/s0040-4039(00)92227-5
日期:1992.4
Sodium dimethyl malonate reacted with naphthylmethyl and 1-naphthylethyl alcohol derivatives in DMF at 20-80-degrees-C, under palladium(0) / phosphine catalysis. to give the substitution products dimethyl naphthylmethyl- and 1-naphthylethylmalonates. respectively, in good (75-83%) yield.