A first regioselective synthesis of 3-fluoroalkylated benzofurans via palladium-catalyzed annulation of fluorine-containing internal alkynes with variously substituted 2-iodophenol
The palladium-catalyzed annulation reaction of a variety of fluorine-containing internal alkynes with 2-iodophenol derivatives was investigated. The use of P(t-Bu)3 as a ligand on palladium was found to be crucial in this annulation reaction, resulting in the exclusive formation of 3-fluoroalkylated benzofurans in high yields. 19F NMR analysis of the reaction mixture revealed that the addition of phenol
研究了各种含氟内炔与2-碘苯酚衍生物的钯催化的环化反应。已发现使用P(t- Bu)3作为钯上的配体在该环化反应中至关重要,从而导致以高收率独家形成3-氟烷基化的苯并呋喃。反应混合物的19 F NMR分析表明,将苯酚加入到氟代烷基化的炔烃中,随后进行分子内Heck反应,得到相应的3-氟代烷基化的苯并呋喃。
One-pot synthesis of 3-trifluoromethylbenzofurans via tandem iodocyclization and trifluoromethylation of 2-alkynylanisoles
A two-step, one-pot tandem iodocyclization and trifluoromethylation have been developed. A variety of 3-trifluoromethylbenzofurans were prepared in moderate to good yields via the tandem reaction of 2-alkynylanisoles with elemental iodine and (trifluoromethyl)trimethylsilane.
Synthesis of 3-Trifluoromethylbenzofurans via Palladium-Catalyzed Tandem Elimination/Annulation of β-Chloro-β-(trifluoromethyl)styrenes with 2-Halophenols
作者:Lian-Hui Chen、Xing-Guo Zhang、Chong Wang、Chen-Liang Deng
DOI:10.1055/s-0033-1338560
日期:——
A palladium-catalyzed tandem elimination and annulation reaction has been developed. In this way, a variety of 3-trifluoromethybenzofurans were prepared in moderate to good yields via tandem reaction of beta-chloro-beta-(trifluoromethyl)styrenes with 2-iodophenols and 2-bromophenols.