Conversion of acylamidopenicillins to phosphoramidopenicillins, and removal of their phosphoryl side chain.
作者:MASATAKA FUKUMURA、NORITAKA HAMMA、TAKENARI NAKAGOME
DOI:10.1248/cpb.24.3058
日期:——
On sequential treatment of benzylpenicillanates (1) or their sulfoxides (7) with phosphorus pentachloride, methanol, and sodium bicarbonate or dimethylaniline, 6-(dimethylphosphoramido) penicillins (5) or their sulfoxides (8) were obtained. 6-(Dimethylphosphoramido) penicillin sulfoxides (8) were rearranged thermally to their corresponding desacetoxycephalosporins (10). The dimethylphosphoryl group of 7-(dimethylphosphoramido) desacetoxycephalosporins (10) was removed by either a 85% phosphoric acid or polyphosphoric acid, which caused the degradation of β-lactam ring in 6-(dimethylphosphoramido) penicillins (5) and their sulfoxides (8). The dimethylphosphoryl group of penicillins and desacetoxycephalosporins was also removed by phosgene and pyridine to give 6-isocyanatopenicillins (16) and 7-isocyanatodesacetoxycephalosporins (15), respectively.
用五氯化磷、甲醇、碳酸氢钠或二甲基苯胺依次处理苄基青霉烷酸酯(1)或其硫醚(7),可得到 6-(二甲基磷酰氨基)青霉素(5)或其硫醚(8)。6-(二甲基磷酰氨基)青霉素硫醚(8)经热重排后生成相应的去乙酰氧基头孢菌素(10)。用 85% 的磷酸或多磷酸去除 7-(二甲基磷酰氨基)去乙酰氧基头孢菌素(10)的二甲基磷酰基,可使 6-(二甲基磷酰氨基)青霉素(5)及其硫醚(8)中的 β-内酰胺环降解。青霉素和去乙酰氧基头孢菌素的二甲基磷酰也可通过光气和吡啶去除,分别得到 6-异氰酸青霉素(16)和 7-异氰酸去乙酰氧基头孢菌素(15)。