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-memberedring 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
Parallel Syntheses of Eight-Membered Ring Sultams via Two Cascade Reactions in Water
作者:Tao Ji、Yanjie Wang、Min Wang、Ben Niu、Ping Xie、Charles U. Pittman、Aihua Zhou
DOI:10.1021/co400116p
日期:2013.12.9
cascade reaction protocols were developed to synthesize eight-memberedring sultams in water. These protocols employ intermolecular Michael addition by NaOH or NaHS in water, followed by rapid proton transfer and intramolecular 8-endo-tet epoxide ring-opening to give medium-size sultams selectively in one-pot. Novel core structures and high synthetic efficiency make these cascade reactions highly suitable