Pyrolysis of allyl ethers. Unimolecular fragmentation to propenes and carbonyl compounds
作者:R. C. Cookson、S. R. Wallis
DOI:10.1039/j29660001245
日期:——
about 500° allylethers undergo decomposition through a cyclic, six-atom transition state with transfer of a hydrogen atom to give high yields of a carbonylcompound and a propene, in which the double bond has moved from the 2,3- to the 1,2-position of the allyl system. The rate of reaction is rather insensitive to structural variation in either the allyl or alkyl part of the ether. Allyl α-deuterodiphenylmethyl
Palladium/benzoic acid-catalyzed hydroalkoxylation of alkynes
作者:Isao Kadota、Leopold Mpaka Lutete、Akinori Shibuya、Yoshinori Yamamoto
DOI:10.1016/s0040-4039(01)01207-2
日期:2001.8
The reaction of the internal alkyne 1 with alcohols 2 in the presence of a catalytic amount of Pd(PPh3)4 and benzoic acid in dioxane at 100°C gave the allylic ethers 3 in good to high yields. The reaction proceeds via the palladium/benzoic acid-catalyzedisomerization of the alkyne 1 to allene 6, followed by the addition of alcohols 2 to the π-allylpalladium intermediate 7 formed by the hydropalladation
A photoredox benzyl activation was developed via formidable C(sp3)–C(sp3) bonddissociation of 1‐aryl acetone oxime esters, easily prepared from benzyl ketones. The generated benzyl cation coupling with diverse O‐ and N‐ nucleophiles successfully forged important benzyl ether and amines derivatives that are valuable in last‐stage functionalizations.
Palladium-catalyzed coupling of alkynes with alcohols and carboxylic acids
作者:Weijiang Zhang、Anthony R. Haight、Margaret C. Hsu
DOI:10.1016/s0040-4039(02)01436-3
日期:2002.9
The palladium-catalyzed coupling of alkynes with alcohols and carboxylic acids to give allylic ethers and esters has been achieved. With phenols, these conditions furnish the C-alkylation products. (C) 2002 Elsevier Science Ltd. All rights reserved.