Phosphine-Catalyzed (4 + 1) Annulation of <i>o</i>-Hydroxyphenyl and <i>o</i>-Aminophenyl Ketones with Allylic Carbonates: Syntheses and Transformations of 3-Hydroxy-2,3-Disubstituted Dihydrobenzofurans and Indolines
作者:Zifeng Qin、Wei Liu、Danyang Wang、Zhengjie He
DOI:10.1021/acs.joc.6b00596
日期:2016.6.3
A phosphine-catalyzed (4 + 1) annulation reaction of o-hydroxyphenyl and o-aminophenyl ketones with ester-modified allylic carbonates has been developed, providing a facile and efficient method to synthesize functionalized 2,3-disubstituted dihydrobenzofurans and indolines. Under mild conditions and in the catalysis of PPh3 (20 mol %), the reactions of o-hydroxyphenyl or o-aminophenyl ketones readily
已经开发了膦催化的邻羟基苯酚和邻氨基苯基酮与酯改性的烯丙基碳酸酯的(4 +1)环化反应,为合成官能化的2,3-二取代的二氢苯并呋喃和二氢吲哚提供了简便而有效的方法。在温和条件下和在PPH的催化作用3(20摩尔%),的反应Ò羟基苯基或ø -氨基苯基酮容易配料高度官能化的3-羟基-2,3-二取代的二氢苯并呋喃或3-羟基-2,3-双取代的二氢吲哚,产率为40-99%,通常具有非对映选择性。为了进一步扩大该环化反应在功能化苯并呋喃和吲哚合成中的实用性,CuSO还研究了环化产物的4-促进的化学转化。