Selective Synthesis of Seven- and Eight-Membered Ring Sultams via Two Tandem Reaction Protocols from One Starting Material
作者:Min Wang、Yanjie Wang、Xueyong Qi、Guohua Xia、Kun Tong、Jinchang Tu、Charles U. Pittman、Aihua Zhou
DOI:10.1021/ol301535j
日期:2012.7.20
From one starting material, two tandem reaction protocols to synthesize seven- and eight-membered ring sultams were developed. One protocol employs intermolecular epoxide ring-opening by NaN3, followed by an intramolecular 7-endo-trig oxa-Michael addition reaction. The second protocol applies to intermolecular aza-Michael addition of a primary amine, followed by 8-endo-tet intramolecular epoxide ring-opening
从一种起始材料开始,开发了两种串联反应方案以合成七元和八元环的sultams。一种方案采用NaN 3进行分子间环氧开环,然后进行分子内7-内-trig oxa-Michael加成反应。第二种方案适用于伯胺在分子间的氮杂-迈克尔加成反应,然后对所得胺中间体进行8-内-tet分子内环氧化物开环。两种方案在温和的反应条件下均以良好的收率提供了各自的苏丹草。