Photoadditions of phenylacetates to phthalimides give the corresponding benzylated hydroxyphthalimidines in moderate to high yields of 29-90%. With 2-phenylpropanoate, photoaddition affords a diastereoisomeric mixture in a de of 24% in favour of the like-diastereoisomer. L-3-Phenyl lactate and 2-oxo-3-phenylpropanoate both furnish the benzylated product through subsequent loss of formaldehyde and decarbonylation, respectively. (C) 2009 Elsevier Ltd. All rights reserved.
Rhodium-catalyzed CC coupling reactions involving ring opening of strained molecules
作者:Gian Paolo Chiusoli、Mirco Costa、Luca Melli
DOI:10.1016/0022-328x(88)87098-0
日期:1988.12
intramolecular aromatic electrophilic substitution, leading to indene derivatives, can be obtained. Aromaticsubstitution can also occur in a sequential process, involving ring opening, 3-butenoic acid addition, leading to linear and branched isomeric complexes, and selective formation of a benzocycloheptene derivative from the branched isomer. The regioselectivity of 3-butenoic acid insertion is contrasted
The solid state thermal reaction of binary salts obtained from a solution of an equimolar mixture of alkali or alkaline earth salts of but-3-enoic acid and methacrylic acid (3-BA–MA), after conversion to the methyl ester, gave mainly dimethyl (E)-hex-1-ene-1,5-dicarboxylate as a novel cross-coupled dimer. The highest conversion (62.2%) to the cross-coupled dimer was obtained using the potassium salts
Dienoic acids are prepared by reaction of salts of 3-butenoic acid and vinyl halides, in the presence of catalysts which are phosphinic complexes of rhodium or nickel.
Enantio- and Regioselective Iridium-Catalyzed Allylic Esterification
作者:Jianping Qu、Lydia Roßberg、Günter Helmchen
DOI:10.1021/ja411869r
日期:2014.1.29
A highly enantioselective and regioselective Ir-catalyzed allylic esterification is described, in which branched allylic esters are synthesized directly. Carboxylates were used as nucleophiles and linear allylic phosphates as electrophiles. In some cases the allylic substitution reaction was found to be accompanied by a kinetic resolution process, which causes a change of the enantiomeric excess.