Enantioselective synthesis of 3-substituted dihydrobenzofurans through iridium-catalyzed intramolecular hydroarylation
作者:Kana Sakamoto、Takahiro Nishimura
DOI:10.1039/d0ob02421j
日期:——
Intramolecular hydroarylation via C–H activation is one of the most powerful methods to synthesize carbo- and heterocyclic compounds, whereas we still have room for developing a highly enantioselective variant of the reaction. Here we describe Ir-catalyzed enantioselective intramolecular hydroarylation of m-allyloxyphenyl ketones. The enantioselective cyclization was efficiently catalyzed by a cationic
通过C–H活化进行分子内氢芳基化反应是合成碳和杂环化合物的最有效方法之一,而我们仍然有发展反应的高对映选择性的空间。在这里我们描述了m的Ir催化对映选择性分子内氢芳基化-烯丙氧基苯基酮。通过与常规手性双膦配体配位的阳离子铱络合物有效催化对映选择性环化,从而以高收率和高对映选择性得到苯并呋喃。酮的羰基可作为C–H活化的有效引导基团。在合成的效用方面,我们也实现了手性3-取代的二氢苯并呋喃的一锅法合成从容易得到的烯丙基碳酸酯和米-hydroxyacetophenones经由顺序Pd-催化的烯丙基取代和Ir催化的分子内hydroarylation。