Synthesis of Indazolones via Friedel–Crafts Cyclization of Blocked (Masked) <i>N</i>-Isocyanates
作者:Eslam B. Elkaeed、Jing An、André M. Beauchemin
DOI:10.1021/acs.joc.7b01607
日期:2017.9.15
are rare amphoteric reagents with high, but underdeveloped synthetic potential. Herein, we study the formation of indazolones by Friedel–Crafts cyclization of N-isocyanates usingblocked (masked) N-isocyanate precursors: the effect of the masking group and the reaction scope have been delineated. Substrate synthesis has also been improved using a reported copper-catalyzed coupling of arylbismuth(V) reagents
Regioselective Synthesis of 1-Alkyl- or 1-Aryl-1<i>H</i>-indazoles via Copper-Catalyzed Cyclizations of 2-Haloarylcarbonylic Compounds
作者:Dolores Viña、Esther del Olmo、José L. López-Pérez、Arturo San Feliciano
DOI:10.1021/ol062890e
日期:2007.2.1
[reaction: see text] A general method for the one-step regioselective synthesis of 1-alkyl- or 1-aryl-1H-indazoles from ortho-halogenated alkanoylphenones, benzophenones, and arylcarboxylic acids, via copper-catalyzedamination, was developed by using 0.2% mol of CuO in the presence of K(2)CO(3). The reaction involves amination followed by intramolecular dehydration. Different functionalized alkyl
Dyeing composition comprising a cationic tertiary para-phenylenediamine and heterocyclic coupler, methods and uses
申请人:L'OREAL
公开号:US20040231067A1
公开(公告)日:2004-11-25
The subject of the present application is a dyeing composition for dyeing keratinous fibres, in particular human keratinous fibres such as hair, comprising, in an appropriate dyeing medium, at least one cationic tertiary para-phenylenediamine containing a pyrrolidine ring, and at least one particular heterocyclic coupler.
The subject of the invention is also the dyeing method using this composition.
Composition tinctoriale comprenant une paraphénylènediamine tertiaire cationique et un coupleur hétérocyclique ou un hydroxybenzamide; procédés et utilisations
申请人:L'OREAL
公开号:EP1428510A1
公开(公告)日:2004-06-16
La présente demande a pour objet une composition tinctoriale pour la teinture des fibres kératiniques, en particulier des fibres kératiniques humaines telles que les cheveux, comprenant dans un milieu de teinture approprié au moins une paraphénylènediamine tertiaire cationique contenant un noyau pyrrolidinique et au moins un coupleur hétérocyclique particulier, ou un hydroxybenzamide.
L'invention a aussi pour objet le procédé de teinture mettant en oeuvre cette composition.