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KMID : 0370219870310010040
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Yakhak Hoeji
1987 Volume.31 No. 1 p.40 ~ p.41
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Cyclocondensation of 2-Substituted-4-hydroxy-2H-1,2-benzothiazine-3-carboxylic acid 1,1-dioxides with Dicyclohexylcarbodiimide
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서정진/Suh JJ
홍유화/Hong YH
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Abstract
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4-Hydroxy-2H-1,2-benzothiazine-3-carboxylic acid 1a was reacted with 2 equivalents of dicyclohexylcarbodiimide (DCC) to give 2-cyclohexyl-3-cyclohexylimino-4,5-dihydro-1H-imidazo[1,5-b][1,2]benzothiazine-10,10a-dihydro-1,10-dione 5,5-dioxide 2a and dicyclohexylurea (DCU). On the other hand 2-substituted-4-hydroxy-2H-1,2-benzothiazine-3-carboxylic acid 1,1-dioxide 1b or c was reacted with DCC to give 2-cyclohexylimino-3-cyclohexyl-5-alkyl-4-oxo-2,5H-1,3-oxazino[5,6-c]-1,2-benzothiazine 6,6-dioxide 2b or c and DCU.
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