Tandem Migration–Carboalkoxylation of o-Isocyanophenyl Acetals Leading to Benzoxazoles
摘要:
An efficient approach to benzoxazoles via tandem migration carboalkoxylation of o-isocyanophenyl acetals has been developed. Both a Lewis acid and base are essential for this reaction, and the BF3 center dot OEt2/2,4,6-collidine combination is the best choice for cooperative transformation.
Supported Palladium Nanoparticles Catalyzed Reductive Carbonylation of Nitroarenes to <i>N</i>
-Arylformamides
作者:Vandna Thakur、Ajay Kumar、Nishtha Sharma、Arun K. Shil、Pralay Das
DOI:10.1002/adsc.201700944
日期:2018.2.1
A facile reductive carbonylation reaction of nitroarenes to N‐arylformamide synthesis was investigated under polymer supported palladium (Pd@PS) nanoparticles catalyzed conditions. Dual role of oxalic acid dihydrate ((CO2H)2 ⋅ 2H2O) as H2 source for hydrogenation and CO source for carbonylation reaction for desired products synthesis was critically investigated under favorable DMF solvent conditions
KO<sup><i>t</i></sup>Bu-Promoted Transition-Metal-Free Transamidation of Primary and Tertiary Amides with Amines
作者:Tridev Ghosh、Snehasish Jana、Jyotirmayee Dash
DOI:10.1021/acs.orglett.9b02306
日期:2019.9.6
transamidation of primary and tertiary amides with a range of aryl, heteroaryl, and aliphatic amines using potassium tert-butoxide. The reaction proceeds at roomtemperature under transition-metal-free conditions providing secondary amides in high yields. Moreover, reaction of cyclopropyl amine with tertiary amides proceeds with ring-opening to provide a rapid access to enamides.
Keratinous fiber dye composition containing a 2-substituted
申请人:Kao Corporation
公开号:US05334225A1
公开(公告)日:1994-08-02
A keratinous fiber dye composition comprising a developer and a coupler, wherein the coupler is a 2-substituted amino-5-alkylphenol derivative represented by the following formula (1): ##STR1## wherein the all symbols are defined in the disclosure, is disclosed. The keratinous fiber dye composition imparts a color tone of a high chroma and is excellent in coloring power and fastness.
A dye composition for a keratinous fiber comprising a developer and a coupler, wherein the coupler is a 2- substituted amino-5-alkylphenol derivative represented by the following formula (1):
wherein the all symbols are defined in the disclosure, is disclosed. The dye composition imparts a color tone of a high chroma and is excellent in coloring power and fastness.
Composition de teinture d'oxydation des fibres kératiniques et procédé de teinture mettant en oeuvre cette composition
申请人:L'OREAL
公开号:EP1093789A1
公开(公告)日:2001-04-25
L'invention a pour objet une composition pour la teinture d'oxydation des fibres kératiniques, et en particulier des fibres kératiniques humaines telles que les cheveux comprenant, dans un milieu approprié pour la teinture, au moins une base d'oxydation choisie parmi certains dérivés substitués du para-aminophénol et leurs sels d'addition avec un acide, et au moins un coupleur choisi parmi des dérivés 2-substitués d'amino-5-alkylphénols, ainsi que le procédé de teinture mettant en oeuvre cette composition.