General and Efficient α-Oxygenation of Carbonyl Compounds by TEMPO Induced by Single-Electron-Transfer Oxidation of Their Enolates
作者:Emanuela Dinca、Philip Hartmann、Jakub Smrček、Ina Dix、Peter G. Jones、Ullrich Jahn
DOI:10.1002/ejoc.201200736
日期:2012.8
for the synthesis of protected α-oxygenated carbonylcompounds is reported. It is based on the single-electron-transfer oxidation of easily generated enolates to the corresponding α-carbonyl radicals. Coupling with the stable free radical TEMPO provides α-(piperidinyloxy) ketones, esters, amides, acids or nitriles in moderate-to-excellent yields. Enolate aggregates influence the outcome of the oxygenation
The esterification of variety of acidchlorides with alcohols in the presence of zinc is described. The easy formation of t-butyl and pivaloyl esters are the additional importance of this procedure.
[EN] PROCESSES FOR SYNTHESIZING ESTERS BY 1,4-ADDITION OF ALKANOIC ACIDS TO MYRCENE OR ISOPRENE<br/>[FR] PROCEDES POUR SYNTHETISER DES ESTERS PAR ADDITION 1,4 D'ACIDES ALCANOIQUES A DU MYRCENE OU A DE L'ISOPRENE
申请人:UNIV LOYOLA CHICAGO
公开号:WO2005044774A1
公开(公告)日:2005-05-19
Processes are disclosed for synthesizing esters useful in flavorings and fragrances from ß-pinene, myrcene and/or isoprene. The esters can be used in the manufacture of citral, precursors to citral and other products or precursors such as vitamins, nutritional supplements, flavorings, fragrances and other products. The process includes a 1,4-addition of an alkanoic acid to the conjugated diene of myrcene (which can be generated from ß-pinene) or the conjugated diene of isoprene to produce esters thereof.
Photocatalyzed
<i>ortho</i>
‐Alkylation of Pyridine
<i>N</i>
‐Oxides through Alkene Cleavage
作者:Wang Zhou、Tomoya Miura、Masahiro Murakami
DOI:10.1002/anie.201801305
日期:2018.4.23
A photocatalyzed reaction of pyridine N‐oxides with alkenes gives ortho‐alkylated pyridines with cleavage of the carbon–carbon double bond. Benzyl and secondary alkyl groups are incorporated at the ortho position of pyridines in one pot.
METHOD FOR PRODUCING OPTICALLY ACTIVE CYCLOPROPANE CARBOXYLIC ACID ESTER COMPOUND, ASYMMETRIC COPPER COMPLEX, AND OPTICALLY ACTIVE SALICYLIDENEAMINOALCOHOL COMPOUND
申请人:Masumoto Katsuhisa
公开号:US20110166372A1
公开(公告)日:2011-07-07
A process for producing an optically active cyclopropanecarboxylic acid ester compound represented by the formula (4):
(wherein R
5
, R
6
and * each represents the same meaning as defined below), comprising reacting a diazoacetic acid ester represented by the formula (2):
N
2
CHCO
2
R
5
(2)
(wherein R
5
represents an alkyl group having 1 to 15 carbon atoms or the like) with a compound represented by the formula (3):
(wherein R
6
represents an alkyl group having 1 to 15 carbon atoms or the like), in the presence of an asymmetric copper complex obtained by reacting a copper compound and an optically active salicylideneaminoalcohol compound represented by the formula (1):
(wherein R
1
represents an alkyl group having 1 to 4 carbon atoms or the like, R
2
represents a hydrogen atom or the like, R
3
and R
4
independently represent a hydrogen atom or the like, and * represents an asymmetric center).