Synthesis 2017; 49(03): 557-564
DOI: 10.1055/s-0035-1562538
paper
© Georg Thieme Verlag Stuttgart · New York

Selective Synthesis, Characterization of Isomerically Pure Arylated Benzo[1,2-b:6,5-b′]dithiophenes by Regioselective Suzuki–Miyaura Reaction and Evaluation of the Catalytic Properties of Nickel versus Palladium Complexes

Zahid Hassan*
a   Chair of Oman’s Medicinal Plants and Marine Natural Products, University of Nizwa, PO Box 33, PC 616, Birkat Al-Mauz, Oman   Email: zahidhassan@unizwa.edu.om   Email: aharrasi@unizwa.edu.om
b   Department of Biological Sciences & Chemistry, University of Nizwa, PO Box 33, PC 616, Birkat Al-Mauz, Oman
c   Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
,
Ahmed Al-Harrasi*
a   Chair of Oman’s Medicinal Plants and Marine Natural Products, University of Nizwa, PO Box 33, PC 616, Birkat Al-Mauz, Oman   Email: zahidhassan@unizwa.edu.om   Email: aharrasi@unizwa.edu.om
b   Department of Biological Sciences & Chemistry, University of Nizwa, PO Box 33, PC 616, Birkat Al-Mauz, Oman
,
Tania Rizvi
a   Chair of Oman’s Medicinal Plants and Marine Natural Products, University of Nizwa, PO Box 33, PC 616, Birkat Al-Mauz, Oman   Email: zahidhassan@unizwa.edu.om   Email: aharrasi@unizwa.edu.om
,
Javid Hussain
a   Chair of Oman’s Medicinal Plants and Marine Natural Products, University of Nizwa, PO Box 33, PC 616, Birkat Al-Mauz, Oman   Email: zahidhassan@unizwa.edu.om   Email: aharrasi@unizwa.edu.om
b   Department of Biological Sciences & Chemistry, University of Nizwa, PO Box 33, PC 616, Birkat Al-Mauz, Oman
,
Peter Langer
c   Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
d   Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany
› Author Affiliations
Further Information

Publication History

Received: 09 June 2016

Accepted after revision: 21 July 2016

Publication Date:
01 September 2016 (online)


Abstract

Selective synthesis of isomerically pure, angular-shaped benzo[1,2-b:6,5-b′]dithiophenes and various aryl-substituted analogues via the regioselective Suzuki–Miyaura cross-coupling reaction is described. The structural assignments of symmetrical and unsymmetrical derivatives of benzodithiophenes and coumarin-type polyheterocycles are based on X-ray crystallography and spectroscopic studies. A comparative study of nickel versus palladium complexes demonstrated that the nickel complex NiCl2(dppe) is more effective in terms of reactivity and yields than palladium catalysis in the Suzuki–Miyaura cross-coupling of hindered 3,6-dichlorobenzo[1,2-b:6,5-b′]dithiophenes with arylboronic acids.

Supporting Information