Synlett 2020; 31(19): 1947-1952
DOI: 10.1055/s-0040-1707280
letter

Integrated Synthesis of Thienyl Thioethers and Thieno[3,2-b]thiophenes via 1-Benzothiophen-3(2H)-ones

a   Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan   Email: mitsudo@cc.okayama-u.ac.jp   Email: suga@cc.okayama-u.ac.jp
,
Nanae Habara
a   Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan   Email: mitsudo@cc.okayama-u.ac.jp   Email: suga@cc.okayama-u.ac.jp
,
Yoshiaki Kobashi
a   Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan   Email: mitsudo@cc.okayama-u.ac.jp   Email: suga@cc.okayama-u.ac.jp
,
Yuji Kurimoto
a   Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan   Email: mitsudo@cc.okayama-u.ac.jp   Email: suga@cc.okayama-u.ac.jp
,
Hiroki Mandai
b   Department of Pharmacy, Faculty of Pharmacy, Gifu University of Medical Science, 4-3-3 Nijigaoka, Kani, Gifu 509-0293, Japan
,
Seiji Suga
a   Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan   Email: mitsudo@cc.okayama-u.ac.jp   Email: suga@cc.okayama-u.ac.jp
› Author Affiliations
This work was supported in part by JSPS KAKENHI grants numbers JP16K05695, JP16K05777, JP19K05477, JP19K05478, and JP18H04455 in Middle Molecular Strategy, and by the Okayama Foundation for Science and Technology.


Abstract

A one-pot procedure for the synthesis of thienyl thioethers is described. Several thienyl thioethers were synthesized by a TfOH-promoted Friedel–Crafts-type cyclization, a subsequent nucleophilic attack by an arenethiol, and dehydration. This protocol was successfully applied to the synthesis of thienoacene derivatives by using a Pd-catalyzed dehydrogenative cyclization.

Supporting Information



Publication History

Received: 20 January 2020

Accepted after revision: 05 August 2020

Article published online:
21 September 2020

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