Scandium triflate-catalysed synthesis of <i>N</i>-substituted pyrroles from amine and 2,5-dimethoxytetrahydrofuran
作者:Bing Zuo、Jiuxi Chen、Miaochang Liu、Jinchang Ding、Huayue Wu、Weike Su
DOI:10.3184/030823409x393628
日期:2009.1
The Clauson–Kass pyrrole synthesis catalysed by scandium triflate afforded N-substituted 2- and 3-unsubstituted pyrroles with yields ranged from good to excellent. Aromatic amines, heteroaomatic amines, 4-methylbenzenesulfonamide and 2-chlorobenzamide are good substrates in this transformation.
Unique chemoselective Clauson–Kass reaction of substituted aniline catalyzed by MgI2 etherate
作者:Xingxian Zhang、Junchen Shi
DOI:10.1016/j.tet.2010.12.018
日期:2011.2
Clauson–Kass reaction of various substitutedaniline, primary aryl amide, and sufonyl amide with 2,5-dimethoxytetrahydrofuran was realized in the presence of 10 mol % of MgI2 etherate in a mild, efficient, and highly chemoselective manner. Iodide counterion and solvents (i.e., MeCN) played the critical roles for the unique reactivity of this catalytic system.