Journal
TETRAHEDRON LETTERS
Volume 42, Issue 6, Pages 1167-1169Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(00)02199-7
Keywords
solid-phase synthesis; 1,4-benzothiazin-3(4H)-one; 1,4-benzoxazin-3(4H)-one
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The first solid-phase synthesis of 1,4-benzothiazin-3(4H)-ones and 1,4-benzoxazin-3(4H)-ones is reported. Alkylation of the immobilized 4-hydroxy-3-nitrobenzamide 2a and 3-nitro-4-sulfanylbenzamide 2b, followed by reduction and cyclization gave 4. Further alkylation and acylation was performed on the amide nitrogen in the presence of sodium hydride followed by TFA cleavage to give the desired 1,4-benzothiazin-3(4H)-ones and 1,4-benzoxazin-3(4H)-ones. (C) 2001 Elsevier Science Ltd. All rights reserved.
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