Acidic degradation of cefodizime (THR-221) and structural elucidation of the products. I.
作者:Teruyoshi MARUNAKA、Eiji MATSUSHIMA、Yoshinori MINAMI、Ryotaro AZUMA、Ken-ichiro YOSHIDA、Yukihiko UMENO
DOI:10.1248/cpb.37.367
日期:——
Cefodizime sodium (CDZM, THR-221) is a new semi-synthetic cephalosporin. The acidic degradation of cefodizime and structural elucidation of the degradation products were investigated. In acidic solution, cefodizime was converted to the anti-form of cefodizime [THR-221-A] and the Δ3-cephem form [THR-221-B]. In another degradation pathway, cefodizime was degraded to desacetyl cefotaxime [THR-221-I] and mercaptothiazole [THR-221-IV]. THR-221-I was further changed to desacetyl cefotaxime lactone [THR-221-IIa] and its anti-form [THR-221-IIb], two isomers of deslactam desacetyl cefotaxime lactone [THR-221-III and -III'], deslactam descarboxy desacetyl cefotaxime lactone [THR-221-IVa] and its anti-form [THR-221-IVb] and methoxyimino-aminothiazolyl aldehyde [THR-221-V].Based on the structural elucidation, the acidic degradation pathways of cefodizime were determined.
头孢地嗪钠(CDZM,THR-221)是一种新型半合成头孢菌素。研究人员对头孢地嗪的酸性降解及其降解产物的结构进行了研究。在酸性溶液中,头孢地嗪被转化为头孢地嗪的抗形式[THR-221-A]和Δ3-cephem形式[THR-221-B]。在另一条降解途径中,头孢地嗪被降解为去乙酰头孢他啶[THR-221-I]和巯基噻唑[THR-221-IV]。THR-221-I 进一步转变为去乙酰头孢他啶内酯[THR-221-IIa]及其反形式[THR-221-IIb],即去内酰胺去乙酰头孢他啶内酯的两种异构体[THR-221-III 和 -III']、去内酰胺脱羧去乙酰头孢他啶内酯[THR-221-IVa]及其反形式[THR-221-IVb]和甲氧基亚氨基噻唑醛[THR-221-V]。在阐明结构的基础上,确定了头孢地嗪的酸性降解途径。