Synthesis 2021; 53(14): 2422-2434
DOI: 10.1055/a-1416-4924
paper

A Simple and Efficient Synthesis of Fused Benzo[b]thiophene Derivatives

Evgeny B. Ulyankin
a   Department of Organic Chemistry, Omsk F. M. Dostoevsky State University, Mira Ave. 55a, 644077 Omsk, Russian Federation
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
,
Anastasia S. Kostyuchenko
a   Department of Organic Chemistry, Omsk F. M. Dostoevsky State University, Mira Ave. 55a, 644077 Omsk, Russian Federation
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
,
Sergey A. Chernenko
a   Department of Organic Chemistry, Omsk F. M. Dostoevsky State University, Mira Ave. 55a, 644077 Omsk, Russian Federation
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
,
Mikhail O. Bystrushkin
a   Department of Organic Chemistry, Omsk F. M. Dostoevsky State University, Mira Ave. 55a, 644077 Omsk, Russian Federation
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
,
Anna L. Samsonenko
a   Department of Organic Chemistry, Omsk F. M. Dostoevsky State University, Mira Ave. 55a, 644077 Omsk, Russian Federation
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
,
Anton L. Shatsauskas
a   Department of Organic Chemistry, Omsk F. M. Dostoevsky State University, Mira Ave. 55a, 644077 Omsk, Russian Federation
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
,
a   Department of Organic Chemistry, Omsk F. M. Dostoevsky State University, Mira Ave. 55a, 644077 Omsk, Russian Federation
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
› Author Affiliations
This work was supported by the Russian Science Foundation (Grant No. 20-73-10043).


Abstract

A new approach to the synthesis of fused benzothiophene derivatives was developed based on iodine-promoted photocyclization of 4,5-diaryl-substituted thiophenes obtained in three steps from commercially­ available compounds. Comparative analysis showed that photochemical cyclization is a more efficient method for the preparation of fused benzo[b]thiophene derivatives, compared to oxidative coupling of 4,5-diaryl-substituted thiophenes in the presence of iron(III) chloride and palladium-catalyzed intramolecular arylation. This new approach provides an efficient synthesis of functionally substituted naphtho[2,1-b:3,4-b′]dithiophenes, phenanthro[9,10-b]thiophenes, benzo[1,2-b:3,4-b′:6,5-b′′]trithiophenes, as well as new fused heterocycles containing a pyridine ring and/or a carbazole moiety.

Supporting Information



Publication History

Received: 28 January 2021

Accepted after revision: 08 March 2021

Accepted Manuscript online:
08 March 2021

Article published online:
12 April 2021

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