Chemistry of O-Silylated Ketene Acetals: A Mild and Convenient Synthesis of .BETA.-Lactam Antibiotics.
作者:Yasuyuki KITA、Norio SHIBATA、Osamu TAMURA、Takashi MIKI
DOI:10.1248/cpb.39.2225
日期:——
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.
在干燥的乙腈中,在一定量的碘化锌催化下,β-酰胺基硫醚(1)与 O-硅烷化酮缩醛(16)发生反应,得到 4-苯硫基氮杂环丁烷-2-酮(17)。用间氯过苯甲酸氧化 17 得到相应的硫氧化物 (18),再用 16 处理得到氮杂环丁烷-2-酮酯 (20),这是已知的 PS-5 型碳青霉烯类抗生素的前体。