Transition-Metal-Catalyzed Selective Cyclization Strategy to 2-Substituted Benzofurans and Indoles en Route to the Oxa Analogues of Isocryptolepine
作者:Satrajit Indu、Parthasarathi Subramanian、Krishna P. Kaliappan
DOI:10.1002/ejoc.201402869
日期:2014.11
A selective catalytic route to benzofurans and indoles from similar starting materials has been developed. A two-step protocol that involves a transition-metal-catalyzed domino Sonogashira coupling between 2-ethynylanilines and 2-iodophenols followed by selective O- and N-cyclizations afforded 2-(benzofuran-2-yl)anilines and 2-(indol-2-yl)phenols, respectively. The 2-(benzofuran-2-yl)anilines were
已经开发了一种从类似起始材料中选择性催化苯并呋喃和吲哚的路线。一个两步协议,涉及 2-乙炔基苯胺和 2-碘苯酚之间的过渡金属催化多米诺 Sonogashira 偶联,然后选择性的 O-和 N-环化得到 2-(苯并呋喃-2-基)苯胺和 2-(吲哚- 2-基)酚类,分别。2-(苯并呋喃-2-基)苯胺进一步用于路易斯酸催化的 Pictet-Spengler 型环化反应,以制备异隐油碱的氧杂类似物。