<i>i</i>-Pr<sub>2</sub>NMgCl·LiCl Enables the Synthesis of Ketones by Direct Addition of Grignard Reagents to Carboxylate Anions
作者:Kilian Colas、A. Catarina V. D. dos Santos、Abraham Mendoza
DOI:10.1021/acs.orglett.9b02899
日期:2019.10.4
preparation of ketones from carboxylate anions is greatly limited by the required use of organolithiumreagents or activated acyl sources that need to be independently prepared. Herein, a specific magnesium amide additive is used to activate and control the addition of more tolerant Grignardreagents to carboxylate anions. This strategy enables the modular synthesis of ketones from CO2 and the preparation
One-step synthesis of ketones from car☐ylic acids and grignard reagents in the presence of a nickel(II)-phosphine catalyst.
作者:V. Fiandanese、G. Marchese、L. Ronzini
DOI:10.1016/s0040-4039(00)88199-x
日期:1983.1
A one-step synthesis of diaryl and alkyl-aryl ketones by the reaction of car☐ylic acid with Grignard reagents in the presence of NiCl2(Ph2PCH2CH2PPh2) as catalyst is described. In the nickel-catalyzedGrignardreaction the formation of alcohols is nearly completely suppressed.
Esters comprising a secondary carbamoyl function and their use as odorant alcohol precursors
申请人:——
公开号:US20020144360A1
公开(公告)日:2002-10-10
The compounds of the formula
1
in which the dotted line indicates the location of a single or double bond; R
1
represents a radical derived from an odoriferous alcohol of the formula R
1
OH; R
2
represents a hydrogen atom, a linear or branched, saturated or unsaturated C
1
-C
30
hydrocarbon radical, or an aliphatic or aromatic cyclic compound having 5 or 6 carbon atoms, this radical R
2
possibly comprising heteroatoms of oxygen, sulphur or nitrogen; the symbols R
3
, R
4
and R
4
′, considered independently, represent a hydrogen atom, a linear or branched, saturated or unsaturated, if necessary substituted, C
1
to C
20
hydrocarbon radical possibly comprising one or more heteroatoms, or, when considered together with the carbon atoms to which they are bonded, can form aromatic or aliphatic monocyclic, bicyclic or tricyclic compounds, the radicals R
3
, R
4
and R
4
′ possibly comprising functional groups of the ester and carbamoyl type so as to liberate several molecules of odoriferous alcohol R
1
OH per single molecule of precursor, are new compounds capable of liberating an odoriferous alcohol of the formula R
1
OH upon hydrolysis of the ester bond.
Processes and compositions are described for the use in perfume aroma augmenting, modifying, altering and enhancing compositions and as perfume, cologne and perfumed article aroma imparting materials of mixtures of 3-methyl-1- phenyl-pentanol-5 and one or more butanoyl cyclohexane derivatives.
PROCESS FOR PREPARATING OPTICALLY ACTIVE COMPOUNDS
申请人:Japan Science and Technology Corporation
公开号:EP0916637A1
公开(公告)日:1999-05-19
The present invention relates to a novel, highly practical method for producing optically active compounds such as optically active alcohol and optically active amine useful for various utilities such as synthetic intermediates of drugs, liquid crystal materials, and optical resolution agents, comprising hydrogen transfer-type asymmetric reduction in the presence of a transition metal catalyst and an optically active nitrogen-containing compound or a transition metal catalyst with an optically active nitrogen-containing compound as the asymmetric ligand, and a hydrogen-donating organic or inorganic compound.
In accordance with the present invention, characteristically, an optically active secondary alcohol can be recovered through the hydrogen transfer-type oxidation from racemic secondary alcohol or meso-type diol.