Highly asymmetric synthesis of (+)-corsifuran A. Elucidation of the electronic requirements in the Ruthenium–NHC catalyzed hydrogenation of benzofurans
作者:Nuria Ortega、Bernhard Beiring、Slawomir Urban、Frank Glorius
DOI:10.1016/j.tet.2012.03.109
日期:2012.7
synthesis of ent-corsifuran A by a highly asymmetric hydrogenation of a benzofuran precursor is reported. In addition, the electronic influence of the substituents on the asymmetric hydrogenation of benzofurans is provided. Whereas the hydrogenation of electron-deficient benzofurans was achieved under very mild conditions, the presence of electron-donating groups in the benzofuran required harsher reaction
据报道,通过苯并呋喃前体的高度不对称氢化,短而有效地合成了对-CorsifuranA。另外,提供了取代基对苯并呋喃的不对称氢化的电子影响。缺电子的苯并呋喃的氢化反应是在非常温和的条件下进行的,而苯并呋喃中给电子基团的存在需要更苛刻的反应条件才能完全转化为2,3-二氢苯并呋喃。