Catalytic Enantioselective Synthesis of Bicyclic Lactam <i>N</i>
,<i>S</i>
-Acetals in One Pot by Cascade Transformations
作者:Kaiheng Zhang、Luca Deiana、Erik Svensson Grape、A. Ken Inge、Armando Córdova
DOI:10.1002/ejoc.201900923
日期:2019.8.7
A versatile strategy for the enantioselective synthesis of bicycliclactam N,S-acetals by one-pot cascade transformations is disclosed. The transformation of readily available substrates is promote ...
the total asymmetric synthesis of valuable tropanealkaloids by catalytic stereoselective transformations is disclosed. The power of this approach is exemplified by the concise catalytic enantioselective total syntheses of (+)‐methylecgonine, (−)‐cocaine and (+)‐cocaine as well as the first catalytic asymmetric total syntheses of a cocaine C‐1 derivative and (+)‐ferruginine starting from 5‐oxo‐protected‐α
Diaryliodonium Salt-Based Synthesis of <i>N</i>-Alkoxyindolines and Further Insights into the Ishikawa Indole Synthesis
作者:Kouhei Shibata、Ken-ichi Takao、Akihiro Ogura
DOI:10.1021/acs.joc.1c00820
日期:2021.8.6
involves reductive elimination of iodobenzene from iodaoxazepine via a four-membered transition state, followed by Meisenheimer rearrangement. Substrates with N-carbamate protection afforded indole in a manner similar to that of the Ishikawa indole synthesis. Preinstallation of a stannyl group as an iodonium salt precursor greatly expanded the substrate scope, and further mechanistic insights are discussed
作者:Luca Deiana、Yan Jiang、Carlos Palo-Nieto、Samson Afewerki、Celia A. Incerti-Pradillos、Oscar Verho、Cheuk-Wai Tai、Eric V. Johnston、Armando Córdova
DOI:10.1002/anie.201310216
日期:2014.3.24
Herein is described a versatile and broad synergistic strategy for expansion of chemical space and the synthesis of valuable molecules (e.g. carbocycles and heterocycles), with up to three quaternary stereocenters, in a highly enantioselective fashion from simple alcohols (31 examples, 95:5 to >99.5:0.5 e.r.) using integrated heterogeneousmetal/chiralaminemultiplerelaycatalysis and air/O2 as the terminal
本文描述了一种通用的,广泛的协同策略,用于扩展化学空间和合成有价值的分子(例如碳环和杂环),并具有多达三个四级立体中心,以对映体的方式从简单的醇类中高度选择性(31例,95:5至> 99.5:0.5 er),使用集成的多相金属/手性胺多重中继催化,并将air / O 2用作末端氧化剂。一种新型的高度1,4-选择性多相金属/胺共催化的烯醛加氢反应也被添加到中继催化序列中。
Cesium Carbonate Promoted Direct Arylation of Hydroxylamines and Oximes with Diaryliodonium Salts
作者:Yang Yang、Xunshen Wu、Jianwei Han、Song Mao、Xiaofei Qian、Limin Wang
DOI:10.1002/ejoc.201402920
日期:2014.11
A transition-metal-free approach for the arylation of hydroxylamines and oximes with diaryliodonium salts was developed. The reaction proceeded smoothly at room temperature in the presence of cesium carbonate. As a result, a wide range of N- and O-arylated hydroxylamines were synthesized in good to excellent yields (45-98%).