作者:P. Mark Jackson、Stanley M. Roberts、Silvia Davalli、Daniele Donati、Carla Marchioro、Alcide Perboni、Stefano Proviera、Tino Rossi
DOI:10.1039/p19960002029
日期:——
Coupling the silyl enol ether 5 and the β-lactam 9(R = Me3Si) affords the ketones 13a–d. Compounds 13a, 13c and 13d are converted into the tricyclic lactams 16–20, 23–25. (Chemoenzymatic synthesis of optically pure silyl enol ether 5 gave access to homochiral lactams 23–25.) In addition the ketoazetidinones 13 are protected as the 1,3-oxazanes 30. A hydroxyethyl moiety is introduced into these oxazanes
甲硅烷基烯醇醚5和β-内酰胺9(R = Me 3 Si)偶联得到酮13a-d。化合物13a,13c和13d转化为三环内酰胺16-20、23-25。(光学纯的甲硅烷基烯醇醚5的化学酶法合成可得到同手性内酰胺23-25。)此外,酮氮杂环丁酮13被保护为1,3-恶唑烷30。使用Bouffard方法进行所需的立体化学反应,得到醇32。形成相应的碳酸硝基苄酯,脱保护和氧化提供了酮35a和35b,其随后分别转化为三苯甲基41a和41b。