Changes in proton-magnetic-resonance spectra during aminolysis and enzymic hydrolysis of cephalosporins.
作者信息
Hamilton-Miller J M, Richards E, Abraham E P
出版信息
Biochem J. 1970 Feb;116(3):385-95. doi: 10.1042/bj1160385.
Abstract
- Changes in proton-magnetic-resonance spectra were followed during the reaction of cephalosporins, deacetylcephalosporins, deacetoxycephalosporins and a Delta(2)-cephalosporin with ND(3) in D(2)O. 2. Changes in proton-magnetic-resonance spectra were also followed during the hydrolysis of a cephalosporin and a deacetylcephalosporin in D(2)O with a beta-lactamase. 3. Structures for the reaction products are proposed. 4. The signals obtained after aminolysis of the beta-lactam ring of a cephalosporin indicate that the reaction is accompanied by expulsion of the acetoxy group as acetate, formation of a double bond in the Delta(4)-position and the appearance of an exocyclic methylene group. 5. Aminolysis of deacetyl- and deacetoxycephalosporins can occur without immediate structural changes in the dihydrothiazine ring. 6. In contrast, the ring structure of the first product of enzymic hydrolysis of a deacetylcephalosporin is apparently identical with that of the product of aminolysis of the cephalosporin itself.
摘要
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6
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Biochem J. 1970 Feb;116(3):371-84. doi: 10.1042/bj1160371.
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