Sulfazecin
Title: Sulfazecin
CAS Registry Number: 77912-79-9
CAS Name: D-g-Glutamyl-N-[(3R)-3-methoxy-2-oxo-1-sulfo-3-azetidinyl]-D-alaninamide
Additional Names: 3-g-D-glutamyl-D-alanylamino-3-methoxyazetidin-2-one-1-sulfonic acid; (3R)-3-(g-D-glutamyl-D-alanylamino)-3-methoxy-2-oxoazetidine-1-sulfonic acid; antibiotic G-6302
Molecular Formula: C12H20N4O9S
Molecular Weight: 396.37
Percent Composition: C 36.36%, H 5.09%, N 14.13%, O 36.33%, S 8.09%
Literature References: Novel monocyclic b-lactam (monobactam) antibiotic, produced by Pseudomonas acidophila and P. mesoacidophila. Isoln, description of physico-chemical and bacteriostatic properties: A. Imada et al., DE 2855949 corresp to US 4229436 (1979, 1980 both to Takeda); eidem, Nature 289, 590 (1981); M. Asai et al., J. Antibiot. 34, 621 (1981). X-ray crystallographic structure determn: K. Kamiya et al., Acta Crystallogr. B37, 1626 (1981). Prepn of fluorinated sulfazecin analogs: K.Yoshioka et al., J. Org. Chem. 49, 1427 (1984); P. F. Bevilacqua et al., ibid. 1430.
Properties: Crystallizes from methanol/water as the alcoholate-hemihydrate; colorless needles, mp 168-170°. [a]D25 +82° (c = 1.0 in water). pKa: 3.4 (COO-); 9.2 (NH3+). Sol in water, DMF, DMSO. Slightly sol in methanol, THF. Practically insol in ethanol, acetone, ethyl acetate, chloroform and other organic solvents. Relatively stable in neutral and weakly acidic solns; unstable in alkaline and strongly acidic solns.
Melting point: mp 168-170°
pKa: pKa: 3.4 (COO-); 9.2 (NH3+)
Optical Rotation: [a]D25 +82° (c = 1.0 in water)
 
Derivative Type: Sodium salt monohydrate
Molecular Formula: C12H19N4NaO9S.H2O
Molecular Weight: 436.37
Percent Composition: C 33.03%, H 4.85%, N 12.84%, Na 5.27%, O 36.66%, S 7.35%
Properties: Colorless powder, browns at 170°, no sharp mp. [a]D20 +85° (c = 0.37 in water).
Optical Rotation: [a]D20 +85° (c = 0.37 in water)

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