Synthesis 2013; 45(10): 1341-1348
DOI: 10.1055/s-0033-1338299
paper
© Georg Thieme Verlag Stuttgart · New York

KF/Al2O3/PEG-400: An Efficient Catalytic System for the Fiesselmann-Type Synthesis of Thiophene Derivatives

Pranjal Bezboruah
Medicinal Chemistry Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, India   Fax: +91(376)2370011   eMail: gogoipranj@yahoo.co.uk   eMail: rc_boruah@yahoo.co.in
,
Pranjal Gogoi*
Medicinal Chemistry Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, India   Fax: +91(376)2370011   eMail: gogoipranj@yahoo.co.uk   eMail: rc_boruah@yahoo.co.in
,
Junali Gogoi
Medicinal Chemistry Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, India   Fax: +91(376)2370011   eMail: gogoipranj@yahoo.co.uk   eMail: rc_boruah@yahoo.co.in
,
Romesh C. Boruah*
Medicinal Chemistry Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, India   Fax: +91(376)2370011   eMail: gogoipranj@yahoo.co.uk   eMail: rc_boruah@yahoo.co.in
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Publikationsverlauf

Received: 01. Februar 2013

Accepted after revision: 11. März 2013

Publikationsdatum:
28. März 2013 (online)


Abstract

A simple and mild protocol has been developed for the synthesis of novel steroidal and nonsteroidal thiophene derivatives from β-halo-α,β-unsaturated aldehydes using KF/Al2O3/PEG-400 as an efficient catalytic system. The β-halo-α,β-unsaturated aldehydes are synthesized from the corresponding ketones using Vilsmeier­ formylation reaction and converted into β-halo-α,β-unsaturated nitriles. The synthetic protocol is subsequently applied to the synthesis of 3-aminothiophene derivatives using β-halo-α,β-unsaturated nitriles.

Supporting Information