Diels−Alder Reactions of Hexafluoro-2-butyne with 2-Heterosubstituted Furans: A Facile and General Synthesis of 1,4-Disubstituted 2,3-Di(trifluoromethyl)benzenes
作者:Gui-Dong Zhu、Michael A. Staeger、Steven A. Boyd
DOI:10.1021/ol0064359
日期:2000.10.1
position-2 of a furan promotes regiospecific opening of the 7-oxa bridge of the Diels-Alder cycloadduct with hexafluoro-2-butyne, producing a 4-heterosubstituted 2,3-di(trifluoromethyl)phenol building block in a single step. The phenol and heteroatom substituent are easily transformed to the corresponding iodide or triflate that readily undergoes Heck, Suzuki, and Stille reactions to install a variety
呋喃的位置2上的供电子杂原子取代基促进Diels-Alder环加合物与六氟-2-丁炔的7-氧杂桥的区域特异性开放,产生4-杂取代的2,3-二(三氟甲基)苯酚结构一步就能阻止。苯酚和杂原子取代基很容易转化为相应的碘化物或三氟甲磺酸酯,这些碘化物或三氟甲磺酸酯易于发生Heck,Suzuki和Stille反应,以高产率安装各种取代基。该方法提供了1,4-二取代的2,3-二(三氟甲基)苯的简便且常规的合成。