Intramolecular substitution reactions involving π-nucleophiles and N-acyliminium cations generated from azetidin-2-ones
作者:Barbara Grzeszczyk、Barbara Szechner、Bartłomiej Furman、Marek Chmielewski
DOI:10.1016/j.tet.2010.03.108
日期:2010.5
The Lewis acid-catalyzed intramolecular substitution reactions of 4-vinyloxy- or 4-acyloxy-azetidin-2-ones with nitrogen-bound allyl-, propargyl- and vinyl-silanes leading to the carbacephams or carbacephems, are reported. The formation of carbapenams was not observed. To illustrate the potential of these reactions to be carried out under solid-phase conditions, a synthesis of diastereomeric 5-vinyl-carbacephams
报道了路易斯酸催化的4-乙烯基氧基-或4-酰氧基-氮杂环丁烷-2-酮与氮键合的烯丙基,炔丙基和乙烯基硅烷的分子内取代反应,从而导致咔唑或萘草。没有观察到碳青霉烯的形成。为了说明这些反应在固相条件下进行的潜力,通过环化/裂解方法进行了非对映异构的5-乙烯基碳烯化合物的合成。