Synthesis 2015; 47(20): 3169-3178
DOI: 10.1055/s-0034-1381040
paper
© Georg Thieme Verlag Stuttgart · New York

Preparation of 2,3-Disubstituted 5-Bromo-1H-pyrrolo[2,3-b]pyridine Framework by Fischer Cyclization

Roman S. Alekseyev*
a   M. V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory 1/3, 119991 Moscow, Russian Federation   Email: alros@hotmail.ru
,
Sabina R. Amirova
b   M. V. Lomonosov Moscow State University, Baku Branch, 1 Universitetskaya St., Khojasan, Binagadi, AZ 1144 Baku, Azerbaijan
,
Vladimir I. Terenin
a   M. V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory 1/3, 119991 Moscow, Russian Federation   Email: alros@hotmail.ru
› Author Affiliations
Further Information

Publication History

Received: 18 April 2015

Accepted after revision: 14 May 2015

Publication Date:
15 July 2015 (online)


Abstract

A simple synthesis of some hard-to-reach heterocycles containing 2,3-disubstituted 5-bromo-1H-pyrrolo[2,3-b]pyridine framework by Fisсher indole cyclization in polyphosphoric acid has been developed. A particularly valuable feature of this synthetic route is the possibility to build a 5-bromo-7-azaindole scaffold with alkyl or aryl substituents at positions 2 and 3 from available starting materials.

Supporting Information