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。
diversity-oriented route to trifluoromethylbenzo[b]furans has been devised. A variety of phenols are directly converted to the corresponding 2-methylthio-3-trifluoromethylbenzo[b]furans by new triflic-anhydride-mediated extended Pummerer annulation reactions with trifluoromethylketene dithioacetal monoxide. The methylthio group of the products undergoes further transformations, which increase the diversity