- Study of the structure of Besulpamide, 1-[(4-Chloro-3-sulfamoylbenzoyl)amino]-2,4,6-trimethylpyridinium hydroxide inner salt, and related compounds, using X-ray crystallography and 1H and 13C nuclear magnetic resonance spectroscopy
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The diuretic and antihypertensive drug Besulpamide, 1-[(4-Chloro-3-sulfamoylbenzoyl)amino]-2,4,6-trimethylpyridinium hydroxide inner salt, and related compounds have been investigated by nmr spectroscopy and mass spectrometry. A mechanism for the formation of the salt 5 is proposed. The tautomerism of hydroxy derivatives of Besulpamide is discussed on the basis of nmr spectroscopy. The single-crystal X-ray investigation of Besulpamide, R = 0.038 (Rw = 0.041), showed two crystallographically independent molecular conformations in the crystal structure, space group PI, a = 8.485(3), b = 14.282(2), c = 15.312(6), α = 69.41(2), β = 82.22(4), γ = 72.78(3).
- Frigola
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p. 1373 - 1382
(2007/10/02)
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- Structure activity relationship for derivatives of xipamide (4 chloro 5 sulfamoyl 2',6' salicyloxylidide)
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The synthesis of various derivatives of 4 chlorosalicylic acid substituted in position 5 is described. The evaluation of their diuretic potency on the rat showed 4 chloro 5 sulfamoyl 2',6' salicyloxylidide (BE 1293, xipamide, 'Aquaphor') as the most effective. The normal urinary volume is increased 10 fold by an oral dose of 100 mg/kg body weight. All changes in the molecular structure of xipamide, even acetylation, the introduction of a second sulfamoyl group or the exchange of the sulfonic group for the carbonyl group lead to a decrease in activity.
- Liebenow,Leuschner
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p. 240 - 244
(2007/10/09)
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