Baylis-Hillman Bromides as a Source of 1,3-Dipoles: Sterically Directed Synthesis of Oxindole-Fused Spirooxirane and Spirodihydrofuran Frameworks
作者:Deevi Basavaiah、Satpal Singh Badsara、Bharat Chandra Sahu
DOI:10.1002/chem.201203756
日期:2013.2.25
Poles apart: The sterically directed [3+2] cycloaddition reactions of dipoles that were generated from Baylis–Hillman bromides with isatin dipolarophiles provided a facile synthetic route to spirodihydrofuran oxindoles and spiroepoxy oxindoles (see scheme). a)–c) Me2S, Cs2CO3, DMF, 15–20 °C, N2, 8 h. EWG: a) CO2Me (Z), b) CO2Me, and c) CN (E).
两极分开:由Baylis–Hillman溴化物与Isatin双极亲和剂产生的偶极在空间上定向的[3 + 2]环加成反应,提供了一条简便的合成途径,以合成螺二氢呋喃和吲哚(见方案)。a)至c)Me 2 S,铯2 CO 3,DMF,15-20℃,N 2,8小时。EWG:a)CO 2 Me(Z),b)CO 2 Me和c)CN(E)。