1,7-octadiene derivatives 6a−k, in good to high yields. The reaction of certain imines 9 with 4 and 5a under similar conditions as above afforded the bis-allylated amines, N-allyl-N-3-butene-1-amine derivatives 10a−f, in good to high yields. The bis-allylation reactions most probably proceed through bis-π-allylpalladium intermediate 2. The above intermolecular bis-allylation was extended to the intramolecular
A novel Pd(0)-catalyzed three-component [3 + 2] cycloaddition of propargyl trifluoroacetates 1, ethylidene malononitriles 2, and allyltributylstannane 3 afforded a variety of multisubstituted cyclopentenes 4 in good to high yields under mild reaction conditions.
Catalytic reactions of bis-π-allylpalladium generated from allyltrifluoroborate
作者:Hiroyuki Nakamura、Kazuki Shimizu
DOI:10.1016/j.tetlet.2010.11.082
日期:2011.1
Bis-pi-allylpalladium-catalyzed nucleophilic allylations to aldehydes 2 and imines 3 have been achieved by replacing allylstannanes with allyltrifluoroborate. Amphiphilic bisallylation of activated olefins 6 with allyltrifluoroborate and allyl acetate also proceeded smoothly in the presence of Pd(2)(dba)(3)center dot CHCl(3) and tricyclohexylphosphine catalysts. (C) 2010 Elsevier Ltd. All rights reserved.