Studies on prodrugs. III. A convenient and practical preparation of ampicillin prodrugs.
                                
                                    
                                        作者:SHOJI IKEDA、FUMIO SAKAMOTO、HIROSATO KONDO、MASARU MORIYAMA、GORO TSUKAMOTO                                    
                                    
                                        DOI:10.1248/cpb.32.4316
                                    
                                    
                                        日期:——
                                    
                                    In order to prepare ampicillin prodrugs conveniently for practical use, a new synthetic method for 6β-aminopenicillanic acid (6-APA) esters as key intermediates of various ampicillin prodrugs has been developed. Acylation of 6-APA esters to ampicillin esters was achieved in good yields by using phenylglycyl chloride hydrochloride in dichloromethane in the presence of sodium bicarbonate and amide, or ammonium bicarbonate alone. KBT-1585, bacampicillin, talampicillin and pivampicillin have been obtained in good yields by this procedure.
                                    为了便于制备实用的
氨苄西林前药,开发了一种新的合成方法,用于作为各种
氨苄西林前药关键中间体的6β-
氨苄青霉烷酸(6-APA)酯。通过在
二氯甲烷中使用苯基甘
氨酰
氯盐酸盐,并在
碳酸氢钠和酰胺或单独使用
碳酸氢铵的存在下进行酰化反应,成功地将6-APA酯转化为
氨苄西林酯,产率良好。通过此方法,KBT-1585、
巴氨西林、他拉西林和匹
氨西林均以良好产率获得。