| 摘要 |
1394644 6-Aminopenicillanic acid and organotin esters thereof A P DA LUZ 13 March 1973 [16 May 1972] 12132/73 Headings C2C and C2J A process for preparing 6-aminopenicillanic acid or an organo-tin ester thereof comprises treating a penicillin ester of Formula I wherein R<SP>1</SP> is an aliphatic or aromatic radical; and R<SP>2</SP>, R<SP>3</SP> and R<SP>4</SP> may be the same or different, and each is an aliphatic or aromatic radical, with an imine-forming reagent to form an iminoderivative thereof, cleaving the imino-linkage in the imino-derivative to give an ester of formula and, if desired, hydrolysing the ester. The ester of Formula I is prepared by reacting a penicillin of the formula or a salt thereof with a compound of formula |
