Process of total synthesis of cephalosporin derivatives and intermediates

Abstract

Abstract PROCESS FOR THE PREPARATION OF RACEMIC OR OPTICALLYACTIVE CEPHALOSPORINE DERIVATIVES OF THE FORMULA 2,3-(-CO-N(-R1)-CH2-),7-NH2-2-CEPHEM WHEREIN R1 IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL, SUBSTITUTED AKYL, ARYL AND SUBSTITUTED ARYL, WHICH COMPRISES THE STEPS OF REACTING AN AMINO ACID OF THE FORMULA R1-NH-CH2-CH2-COOH WITH BENZYL ALCOHOL, CONDENSING THE BENZYL ESTER THUS OBTAINED WITH AN OXALATE, CONVERTING THE BENZYL ESTER OF 2,3DIOXI-4-CARBOXY-PYRROLIDINE INTO THE CORRESPONDING ACID, SUBJECTING SAID ACID TO AMINOMETHYLATION, THUS YIELDING A COMPOUND OF THE FORMULA 1-R1,3-OH,4-(R"-N(-R'')-CH2-)PYRROL-3-IN-2-ONE CONVERTING SAID COMPOUND INTO THE CORRESPONDING 4-ACYLTHIOMETHYL DERIVATIVE, CONVERTING SAID DERIVATIVE INTO THE CORRESPONDING 4-THIOMETHYL DERIVATIVE, CONDENSING SAID DERIVATIVE WITH AN ENAMINE OF THE FORMULA R-OOC-C(-Y)=CH-NH2 TO OBTAIN A THIAZINE DERIVATIVE OF THE FORMULA 2-(Y-CH(-COO-R)-),5-R1-2,3,4,5,6,7-HEXAHYDRO-PYRROLO (3,4-D)-1,3-THIAZIN-4-ONE CONVERTING SAID THIAZINE DERIVATIVE INTO A COMPOUND OF THE FORMULA 2-(H2N-CH(-COOH)-),5-R1-2,3,4,5,6,7-HEXAHYDRO-PYRROLO (3,4-)-1,3-THIAZIN-4-ONE SUBJECTING SAID COMPOUND TO THE ACTION OF A TRITYLATION AGENT, RECOVERING THE THREO ISOMER OF THE TRITYLATED DERIVATIVE, LACTAMIZING SAID THREO ISOMER TO OBTAIN THE Y-LACTAM OF DL-6H,7H-CIS-7-TRITYLAMINO-3-AMINOALKYL-CEPH 3-EME-4-CARBOXYLIC ACID, DETRITYLATING SAID Y-LACTAM AND RECOVERING SAID RACEMIC OF OPTICALLY ACTIVE CEPHALOSPORIN DERIVATIVES. THESE COMPOUNDS ARE USEFUL AS INTERMEDIATES IN THE PREPARATION OF THE CORRESPONDING 7ACYLAMINO DERIVATIVES OF THE FORMULA 2,3-(-CO-N(-R1)-CH2-),7-(R2-NH-)-2-CEPHEM WHEREIN R1 HAS THE ABOVE DEFINITION AND R2 IS THE ACYL OF AN ORGANIC CARBOXYLIC ACID WHICH COMPOUNDS ARE ALSO PART OF THE INVENTION AND ARE USEFUL AS ANTIBIOTICS.

Inventors

• 👤 J Martel
• 👤 R Heymes

Bibliographic Details