desired reductive alkylation of 2-thienyldialkylacetonitriles, a much lower temperature such as -100 ˚C was required. Also with these substrates, an interesting ring-opening/S-alkylation process was observed when the reductive alkylation were performed at -78 ˚C to give 1-alkylsulfanyl-1,3,4-trienes. A mechanistic discussion is given for this observation. reductive alkylation -reductiveaddition- reductive
The present invention relates to compounds of the general formula (1) wherein the variables are defined as given in the description and claims. The invention further relates to uses of and to, processes and intermediates related to compounds of the general formula (I), wherein Q is wherein the substituents of I, Ia and Ib are as defined in description and claims.
作者:Anna Lucia Berger、Karsten Donabauer、Burkhard König
DOI:10.1039/c9sc04987h
日期:——
generation of carbanions from benzylic C–H bonds in a photocatalytic Grignard-type reaction. The combination of photo- and hydrogen atom transfer (HAT) catalysis enables the abstraction of a benzylic hydrogen atom, generating a radical intermediate. This radical is reduced in situ by the organic photocatalyst to a carbanion, which is able to react with electrophiles such as aldehydes or ketones, yielding homobenzylic
Methyl group migration in the reactions of alkynyltrialkylborates
作者:Andrew Pelter、Robert A. Drake
DOI:10.1016/s0040-4039(00)80450-5
日期:1988.1
It is shown that the methyl group cannot be used as a cheap, non-migrating group in the reactions of alkynyltrialkylborates with electrophiles. However, trimethylborane can be used as a methylboronating agent for alkynes, given the right choice of solvent, and this may be of use in terpene synthesis.
Photochemical oxidation and dimerization of alkylbenzenes. Selective reactions of the alkyl side groups
作者:Mordechai Pasternak、Abraham Morduchowitz
DOI:10.1016/s0040-4039(00)88319-7
日期:1983.1
Irradiations of alkylbenzene compounds in an oxygen atmosphere result exclusively in oxidation reactions, while in a less oxidative environment dimerization processes predominate. Under all conditions studied, the reactions took place only at one benzyl position.