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A novel synthesis of 2,3-dihydro-1 H -thieno[3,4- b ]pyrroles via ring transformation of cyclic sulfonium ylides by titanium(IV) chloride-triethylamine system by Hiroshi Maruoka; Kenji Yamagata; Fumi Okabe; Yukihiko Tomioka is a Chemistry article available to read on EtoBox.

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A series of cyclic sulfonium ylides 4a-h reacted with titanium(IV) chloride in the presence of triethylamine to give the corresponding fused 2,3-dihydro-1H-thieno [3,4-b]pyrroles 5a-h, via a ring opening and recyclization. In contrast, treatment of compounds 4a, 4b, 4e and 4f with titanium(IV) chloride, triethylamine and dimethylamine hydrochloride gave the corresponding thiophenes 6a, 6b, 6e and 6f. Furthermore, compounds 6a and 6b easily underwent cyclization with sodium hydride to afford the corresponding 5a and 5b.

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Author

Hiroshi Maruoka; Kenji Yamagata; Fumi Okabe; Yukihiko Tomioka

Publisher

Journal of Heterocyclic Chemistry; Wiley (John Wiley & Sons); Wiley-Blackwell; Wiley; FASEB (ISSN 0022-152X)

Published

2005

Language

EN

Field

Chemistry (Physical Sciences)