Synthese a partir de retronecine et d'acide d'integerrinecique en utilisant le groupemethylthiomethyl comme groupe protecteur activable de la fonction acide
Radical-mediated Carbonylation of Alkyl Iodides in Aqueous Media
作者:Masaharu Sugiura、Hiroyuki Hagio、Shu Kobayashi
DOI:10.1246/cl.2003.898
日期:2003.10
Radical-mediated single carbonylation of alkyl iodides furnishing carboxylic acids proceeded in water using phosphinic acid as a radical initiator in the presence of a surfactant (CTAB). On the other hand, formation of doublecarbonylation product (α-keto carboxylic acid) along with single carbonylation product was observed for the first time, when the reaction was carried out in aqueous ethanol without
CESIUM FLUORIDE-PROMOTED SYNTHESIS OF CARBOXYLIC ACID DERIVATIVES USING 2-FLUOROPYRIDINIUM SALT
作者:Shin-ichiro Shoda、Teruaki Mukaiyama
DOI:10.1246/cl.1980.391
日期:1980.4.5
In the presence of cesium fluoride, the equimolecular reactions of carboxylic acids with alcohols, amines or thiols using 2-fluoropyridinium salt proceeded smoothly under mild conditions to afford the corresponding carboxylic acid derivatives with base sensitive groups in good yields.
Various carboxylic esters or carboxamides are prepared in good yields under nearly neutral conditions from equimolar amounts of free carboxylic acids and alcohols or amines, respectively, by the use of 1,1′-dimethylstannocene as a condensing reagent.
N-alkoxy-n-acylnitrenium ions in intramolecular aromatic addition reactions
作者:Stephen A. Glover、Andre Goosen、Cedric V. McClei、Johan L. Schoonraad
DOI:10.1016/s0040-4020(01)81665-3
日期:——
solvents. These intermediates readily cyclise onto aromatic nuclei on alkozy side-chains to give benzoxazines and benzoxazepines and on the acyl side-chains to give γ, δ and ϵ benzolactams. Spirane products are formed by ipso addition When a 4-methoxy substituent ia present on the side-chain aromatic rings. The yields and regioselectivities of these reactions have been ascribed to different transition structures
A convenient method for synthesizing elongated aliphatic esters fromalkenes is reported. An (alkoxycarbonyl)methyl radical species is generated upon visible‐light irradiation of an ester‐stabilized phosphorus ylide in the presence of a photoredox catalyst. This radical species adds onto the carbon–carbon double bond of an alkene to produce an elongated aliphatic ester.