transformation of CO bonds through a multistep reaction pathway in one pot. Electrolysis of the acidic reaction mixture significantly improved carbonyl reduction and thus facilitated the generation of benzyl carbocations, which show high reactivity towards electron-rich heteroarenes for C–C bond formation.
三氟甲磺酸/硅烷作为协同还原剂,可以通过多步反应途径在一锅中方便地转化 C O 键。酸性反应混合物的电解显着改善了羰基还原,从而促进了苄基碳阳离子的产生,其对富电子杂芳烃具有高反应性,可形成 C-C 键。
Benzofuran and indole synthesis via Cu(<scp>i</scp>)-catalyzed coupling of N-tosylhydrazone and o-hydroxy or o-amino phenylacetylene
作者:Tiebo Xiao、Xichang Dong、Lei Zhou
DOI:10.1039/c2ob26867a
日期:——
A general and practical method to synthesize 2-substituted benzofurans and indoles is described. This method employs easily accessible N-tosylhydrazones and o-hydroxy or o-amino phenylacetylenes as substrates. The reaction proceeds through a CuBr-catalyzed coupling–allenylation–cyclization sequence under ligand-free conditions.