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Photochemical ring contraction of dihydro-1,4-benzothiazines

Authors
Journal
Tetrahedron Letters
0040-4039
Publisher
Elsevier
Publication Date
Volume
35
Issue
20
Identifiers
DOI: 10.1016/s0040-4039(00)76909-7

Abstract

Abstract The pheomelanin precursor 1a and the related dihydro-1,4-benzothiazines 1b–f undergo ring contraction upon irradiation with pyrex-filtered UV light to give 2-methylbenzothiazoles 2a–f in good yields.

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