Synthesis and biological evaluation of 3-chloro-1-carbacephem compounds.
作者:Ikuo MATSUKUMA、Shigeo YOSHIYE、Kenichi MOCHIDA、Yukio HASHIMOTO、Kiyoshi SATO、Ryo OKACHI、Tadashi HIRATA
DOI:10.1248/cpb.37.1239
日期:——
from a 3H-1-carbacephem compound through a sequence of reactions involving addition of thiophenol, oxidation of sulfide to sulfoxide, and alpha-chlorination of the sulfoxide, followed by elimination of phenylsulfinic acid. The 2-beta-methyl analog was similarly prepared, but the 2 alpha-methyl analog was not obtained. Optical resolution of the 3-chloro-1-carbacephem compound was achieved by the employment
通过3H-1-咔ace化合物首先通过一系列反应来制备3-氯-1-咔phe核,这些反应包括添加硫酚,将硫化物氧化成亚砜,将亚砜进行α-氯化,然后消除亚苯基磺酸。类似地制备2-β-甲基类似物,但未获得2-α-甲基类似物。通过使用青霉素酰基转移酶可以实现3-氯-1-甲氧乙啶化合物的光学拆分。即,将7-苯基乙酰胺基衍生物对映选择性地水解,以提供旋光的7-氨基-3-氯-1-卡巴西姆化合物。Carbacefaclor(头孢克洛的carbacephem类似物)通过使用固定化的青霉素酰基转移酶将外消旋的7-氨基-3-氯-1-甲氧苯乙酰亚胺化合物进行酶促苯基甘氨酰化反应,可以直接有效地制备氨基甲酸酯。与头孢克洛相比,如此制得的卡巴菲洛对大多数测试的革兰氏阳性细菌表现出可比的抗菌活性,对典型的革兰氏阴性细菌具有更高的活性。此外,卡巴昔洛具有非常高的化学稳定性。