Process for preparing N-alkylcarbazoles

US5902884A · kind A · utility

Assignee

• Clariant Corporation · DE

Inventors

• Wolfgang Bauer · Krefeld, DE
• Klaus Delpy · Dietzenbach, DE
• Gert Nagl · Niederdorfelden, DE
• Leonhard Unverdorben · Uttenreuth, DE

Key dates

• Filing date: Feb 11, 1998
• Grant date: May 11, 1999
• Expiry date: Feb 11, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D209/86
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for preparing N-alkylcarbazoles The present invention relates to a process for preparing N-alkylcarbazoles of the formula I ##STR1## where R.sup.1 is (C.sub.1 -C.sub.6)-alkyl and PA1 Y is hydrogen, (C.sub.1 -C.sub.6)-alkyl, (C.sub.1 -C.sub.6)-alkoxy, nitro or halogen, by reacting a carbazole of the formula II ##STR2## with an alkyl halide of the formula III EQU R.sup.1 -X III where X is a halogen atom, in an inert solvent in the presence of an inorganic base and a catalyst of the formula IV EQU R.sup.2 R.sup.3 N-(CH.sub.2).sub.n -NR.sup.4 R.sup.5 IV where PA1 n is an integer from 2 to 8, PA1 R.sup.2, R.sup.3 and R.sup.4 are, independently of one another, hydrogen or (C.sub.1 -C.sub.4)-alkyl and PA1 R.sup.5 is hydrogen, (C.sub.1 -C.sub.4)-alkyl, amino-(C.sub.1 -C.sub.4)-alkyl or N,N-di(C.sub.1 -C.sub.4)-alkylamino-(C.sub.1 -C.sub.4)-alkyl.