CAS No 33817-20-8 , 2,2-dimethylpropanoyloxymethyl
(2S,5R,6R)-6-[[(2R)-2-amino-2-phenylacetyl]amino]-3,
3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate

Title: Pivampicillin
CAS Registry Number: 33817-20-8
CAS Name: (2S,5R,6R)-6-[[(2R)-Aminophenylacetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (2,2-dimethyl-1-oxopropoxy)methyl ester
Synonyms: hydroxymethyl 6-(2-amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate pivalate (ester); 6-[D-a-aminophenylacetamido]penicillanic acid pivaloyloxymethyl ester; pivaloyloxymethyl D-a-aminobenzylpenicillinate; ampicillin pivaloyloxymethyl ester; pivaloyloxymethyl ampicillinate
Manufacturers' Codes: MK-191
Molecular Formula: C22H29N3O6S
Molecular Weight: 463.55
Percent Composition: C 57.00%, H 6.31%, N 9.06%, O 20.71%, S 6.92%
Literature References: Semi-synthetic antibiotic related to penicillin. Prepn: E. K. Frederiksen, W. O. Godtfredsen, ZA 6805952; eidem, US 3660575 (1969, 1972 to L?vens Kemiske Fabrik); von Daehne et al., J. Med. Chem. 13, 607 (1970). Pharmacology: eidem, loc. cit.; Jordan et al., Antimicrob. Agents Chemother. 1970, 438; Foltz et al., ibid. 442. Pharmacokinetics in man: M. Ehrnebo et al., J. Pharmacokinet. Biopharm. 7, 429 (1979). Toxicity: von Daehne et al., Antimicrob. Agents Chemother. 1970, 430.
 
Derivative Type: Hydrochloride
CAS Registry Number: 26309-95-5
Trademarks: Pondocil (Leo Pharm); Pondocillin (Leo Pharm); Pondocillina (Sigma-Tau); Sanguicillin (Zdravlje)
Molecular Formula: C22H29N3O6S.HCl
Molecular Weight: 500.01
Percent Composition: C 52.85%, H 6.05%, N 8.40%, O 19.20%, S 6.41%, Cl 7.09%
Properties: Microcrystalline powder, mp 155-156° (decomp). [a]D20 +196° (c = 1 in water). Weak uv max (water): 268, 262, 256 nm (E1%1cm ~3.9, 5.7, 6.3). pKa ~7.0. Relatively stable in acid soln; ester hydrolyzes slowly in neutral soln. pH of 0.5 g/100 ml water: ~4.5. Very sol in water and chloroform; freely sol in ethanol; sparingly sol in n-propanol, tert-butanol, and ethyl ether. LD50 in mice, rats (g/kg): 3.34, 5.00 orally; 3.60, 4.50 s.c. (von Daehne).
Melting point: mp 155-156° (decomp)
pKa: pKa ~7.0
Optical Rotation: [a]D20 +196° (c = 1 in water)
Absorption maximum: uv max (water): 268, 262, 256 nm (E1%1cm ~3.9, 5.7, 6.3)
Toxicity data: LD50 in mice, rats (g/kg): 3.34, 5.00 orally; 3.60, 4.50 s.c. (von Daehne)
 
Therap-Cat: Antibacterial.
Keywords: Antibacterial (Antibiotics); ?Lactams; Penicillins.