Orally absorbable cephalosporin antibiotics. 3. Preparation of biologically active R-isomer of 7-(3-benzothienylglycylamido)deacetoxycephalosporanic acid
作者:Stjepan Kukolja、Janice L. Pfeil、Susan E. Draheim、John L. Ott
DOI:10.1021/jm00150a024
日期:1985.12
were resolved with (+)- and (-)-tartaric acid in acetonitrile to give the corresponding R and S salts. The R-salt 4 was hydrolyzed to (R)-3-benzothienylglycine (5). The amino group in 5 was protected with the Boc function and the protected R amino acid 6 coupled with the p-NB ester of 7-ADCA to give the diprotected cephalosporin 7. After removal of the Boc and p-NB groups, the R isomer of 7-(3-benzo
将(RS)-3-苯并噻吩基甘氨酸的甲基和异丙基酯用(+)-和(-)-酒石酸在乙腈中拆分,得到相应的R和S盐。R盐4水解为(R)-3-苯并噻吩基甘氨酸(5)。5中的氨基被Boc功能保护,被保护的R氨基酸6与7-ADCA的p-NB酯偶联,得到双保护的头孢菌素7。除去Boc和p-NB基团后,R异构体获得了7-(3-苯并噻吩基糖基氨基)脱乙酰氧基头孢菌酸(1)。通过制备色谱将差向性头孢菌素7的p-NB酯分离为R和S异构体。除去保护基后,分离出S差向异构体。报道了R和S差向异构体与头孢菌素1的RS混合物的抗菌活性的比较。