Synthesis 2014; 46(24): 3319-3330
DOI: 10.1055/s-0034-1379011
paper
© Georg Thieme Verlag Stuttgart · New York

A Convenient and Efficient Synthesis of 2-(Het)arylthieno[3,2-b]pyridin-7(4H)-ones and 2,3-Di(het)arylthieno[3,2-b]pyridin-7(4H)-ones

Srinu Puvvala
a   Chemistry Services, GVK Biosciences Pvt. Ltd., IDA Nacharam, Hyderabad 500076, India   Fax: +91(40)66929900   eMail: vinod.jadhav@gvkbio.com   eMail: vinodjadhav1977@gmail.com
b   Department of Chemistry, Jawaharlal Nehru Technological University, Kukatpally, Hyderabad 500085, India
,
Vinod D. Jadhav*
a   Chemistry Services, GVK Biosciences Pvt. Ltd., IDA Nacharam, Hyderabad 500076, India   Fax: +91(40)66929900   eMail: vinod.jadhav@gvkbio.com   eMail: vinodjadhav1977@gmail.com
,
Sheikh M. Farooq
a   Chemistry Services, GVK Biosciences Pvt. Ltd., IDA Nacharam, Hyderabad 500076, India   Fax: +91(40)66929900   eMail: vinod.jadhav@gvkbio.com   eMail: vinodjadhav1977@gmail.com
,
C. Venkata Ramana Reddy
b   Department of Chemistry, Jawaharlal Nehru Technological University, Kukatpally, Hyderabad 500085, India
,
Pavan Kumar Machiraju
a   Chemistry Services, GVK Biosciences Pvt. Ltd., IDA Nacharam, Hyderabad 500076, India   Fax: +91(40)66929900   eMail: vinod.jadhav@gvkbio.com   eMail: vinodjadhav1977@gmail.com
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Publikationsverlauf

Received: 01. Juni 2014

Accepted after revision: 01. August 2014

Publikationsdatum:
28. August 2014 (online)


Abstract

A simple and efficient synthesis of 2-aryl-3-hydroxythieno[3,2-b]pyridin-7(4H)-ones, 7-methoxy-2,3-diarylthieno[3,2-b]pyridines, and 2,3-diarylthieno[3,2-b]pyridin-7(4H)-ones is presented. The synthesis involves thioalkylation of methyl 4-methoxypicolinate at the 3-position, followed by cyclization in situ to give 2-aryl-7-methoxythieno[3,2-b]pyridin-3-ols. Demethylation of these compounds gives the corresponding 2-arylthieno[3,2-b]pyridin-7(4H)-ones. Further functionalization of 7-methoxy-2-aryl­thieno[3,2-b]pyridin-3-ols was achieved by converting the hydroxy group into the corresponding triflate, which underwent palladium-catalyzed cross-coupling to give 7-methoxy-2,3-di(het)arylthieno[3,2-b]pyridines. Subsequent demethylation of the 7-methoxy group gave the corresponding pyridinones.

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