Synthetic studies on 1,2-dehydro-1-carbacephem compounds.
作者:Hiromitsu SAITO、Hideo MATSUSHIMA、Chihiro SHIRAKI、Tadashi HIRATA
DOI:10.1248/cpb.37.275
日期:——
7-Azido-1, 2-dehydro-1-carbacephem 13 was efficiently synthesized by employing ketene-imine cycloaddition, intramolecular Horner-Emmons reaction and elimination of a phenylsulfoxide group or an ammonium group. 7-Acylamino 1, 2-dehydro-1-carbacephems, 18 and 19, were obtained from 13. Infrared absorption frequencies of the β-lactam carbonyl in 1, 2-dehydro-1-carbacephem compounds thus prepared are equal to or higher than those of the corresponding 1-carbacephem compounds. However, 18 and 19 exhibited very poor antibacterial activity.
通过采用酮-亚胺环化反应、分子内霍纳-埃蒙斯反应和消除苯基亚砜基团或铵基团的方法,有效地合成了 7-叠氮-1,2-脱氢-1-卡巴塞姆 13。从 13 中得到了 7-酰氨基 1、2-脱氢-1-卡巴塞姆 18 和 19。由此制备的 1,2-脱氢-1-卡巴西庚化合物中 β-内酰胺羰基的红外吸收频率等于或高于相应的 1-卡巴西庚化合物。然而,18 和 19 的抗菌活性非常差。