SeES anilide was deprotected by radical reduction using tributyltin hydride in the presence of AIBN. The corresponding anilines were obtained in high yields when the hydride and AIBN were added to the system slowly. Since the radical reaction proceeds under neutral conditions, chemoselective deprotection of the SeES group was accomplished. The SeES anilide was stable under various conditions, including
A Synthetic Route to Chiral Benzo-Fused N-Heterocycles via Sequential Intramolecular Hydroamination and Asymmetric Hydrogenation of Anilino-Alkynes
作者:Cong Xu、Yu Feng、Faju Li、Jiahong Han、Yan-Mei He、Qing-Hua Fan
DOI:10.1021/acs.organomet.9b00183
日期:2019.10.28
derivatives, were obtained from anilino-alkynes in high yields (up to 98%) with moderate to excellent enantioselectivities (up to 98% ee) under mild conditions. This protocol features good functional group tolerance and highatomeconomy. Furthermore, this catalytic protocol is applicable to gram-scale synthesis of a naturally occurring alkaloid, (−)-Angustureine.
已经报道了在单一手性钌配合物或由非手性金配合物和手性钌配合物组成的二元体系的催化下有效的顺序分子内加氢/不对称氢化反应。从苯胺衍生物获得了多种对映体富集的苯并稠合的N-杂环,包括1,2,3,4-四氢喹啉,二氢吲哚和2,3,4,5-四氢-1 H-苯并[ b ] pine庚因衍生物-炔烃在温和条件下具有高产率(高达98%)和中等至优异的对映选择性(高达98%ee)。该协议具有良好的官能团耐受性和较高的原子经济性。此外,该催化方案适用于天然存在的生物碱(-)-Angustureine的克规模合成。
Pd(II)/<sup><i>t</i></sup>Bu-quinolineoxazoline: An Air-Stable and Modular Chiral Catalyst System for Enantioselective Oxidative Cascade Cyclization
作者:Wei He、Kai-Tai Yip、Nian-Yong Zhu、Dan Yang
DOI:10.1021/ol902348t
日期:2009.12.17
An air-stable and structurally tunable chiral tBu-quinolineoxazoline/Pd(II) catalyst system has been developed for the enantioselective oxidative cascade cyclization of a variety of disubstituted olefinic substrates, with the apparent advantages of good yields and excellent enantioselectivities (up to 98% ee) and diastereoselectivities (dr >24:1). A transition-state model has also been proposed to
Ionic diamine rhodium complex catalyzed hydroaminomethylation of 2-allylanilines
作者:Kazumi Okuro、Howard Alper
DOI:10.1016/j.tetlet.2010.07.048
日期:2010.9
Ionic diamine rhodium complexes catalyze the hydroaminomethylation of 2-allylanilines. The reaction involves initial hydroformylation followed by reductive amination, which provides direct access to 1,2,3,4-tetrahydroquinolines and 2,3,4,5-1H-1-benzazepines. (C) 2010 Elsevier Ltd. All rights reserved.