A novel simple synthesis of trans-4-carboxymethyl-3-ethylazetidin-2-one is described together with its optical resolution. The (+) acid was converted in five steps into the natural carbapenem antibiotic (+) PS-5.
β-Amido sulfoxides (1) reacted with O-silylated ketene acetal (16) in dry acetonitrile in the presence of a catalytic amount of zinc iodide to give the 4-phenylthioazetidin-2-ones (17). Oxidation of 17 with m-chloroperbenzoic acid gave the corresponding sulfoxides (18), which were treated with 16 to give the azetidin-2-one esters (20), known precursors of PS-5-type carbapenem antibiotics.
New β-lactam antibiotics of the general formula
wherein R is (C1-C6)alkyl or (C3C6)alkenyl, n is zero or one and the stylized group
represents a mono- or polycyclic N-containing heterocyclic group, and their pharmaceutically acceptable salts and esters. Also described and claimed are the process for preparing the new compounds and the pharmaceutical compositions containing them.
通式如下的新型β-内酰胺类抗生素
其中 R 是(C1-C6)烷基或(C3C6)烯基,n 是 0 或 1,且定型基团
代表单环或多环含 N 杂环基团,以及它们的药学上可接受的盐和酯。本发明还描述了新化合物的制备过程以及含有这些化合物的药物组合物。
Fetter, Jozsef; Lempert, Karoly; Horvath, Zoltan, Journal of Chemical Research, Miniprint, 1985, # 12, p. 3901 - 3932
作者:Fetter, Jozsef、Lempert, Karoly、Horvath, Zoltan、Kajtar-Peredy, Maria、Simig, Gyula、Hornyak, Gyula
DOI:——
日期:——
New beta-lactam acetic acid derivatives, the process for preparing them, and their use as intermediates for 1-azabicyclo(3.2.0.)hept-2-ene antibiotics