[CH3:1][N:2]([CH3:7])[CH2:3][CH2:4][CH2:5][OH:6].O[C:9]1[CH:19]=[CH:18][C:12]2[NH:13][C:14](=[O:17])[CH2:15][S:16][C:11]=2[CH:10]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>O1CCCC1>[CH3:1][N:2]([CH3:7])[CH2:3][CH2:4][CH2:5][O:6][C:9]1[CH:19]=[CH:18][C:12]2[NH:13][C:14](=[O:17])[CH2:15][S:16][C:11]=2[CH:10]=1N,N-dimethyl-3-aminopropanol (0.27 g, 5.2 mmol) was added to a mixture of 7-hydroxy-2H-1,4-benzothiazin-3(4H)-one (0.95 g, 5.2 mmol) and triphenylphosphine (1.37 g, 5.2 mmol) in dry tetrahydrofurane (30 ml) under nitrogen atmosphere, followed by diethyl azodicarboxylate (1 g, 5.7 mmol). The mixture was stirred at room temperature for 48 h, concentrated in vacuo, and the product was purified by silica gel chromatography using dichloromethane:methanol gradient of (9:1) to (7:3) as the mobile phase. Yield 1.1 g (75%) mp 120–121° C.
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