A gold(I)‐catalyzed asymmetric intermolecular tandem [3+3]‐cyclization reaction of 2‐(1‐alkynyl)‐2‐ alken‐1‐ones with nitrones has been developed by using Ming‐Phos as a chiral ligand. This method enables access to the stereodivergent synthesis of highly substituted furo[3,4‐d][1,2]oxazines in excellent efficiency and stereoselectivity (up to 99% yield, 99% ee, >20 : 1 dr).
通过使用Ming-Phos作为手性配体开发了金(I)催化的2-(1-炔基)-2-链烯-1-酮与硝酮的不对称分子间串联[3 + 3]环化反应。该方法能够以优异的效率和立体选择性(高达99%的收率,99%ee,> 20:1 dr)获得高度取代的呋喃[3,4- d ] [1,2]恶嗪的立体发散性合成。
Gold(I)-Catalyzed Diastereo- and Enantioselective Synthesis of Polysubstituted Pyrrolo[3,4-<i>d</i>
][1,2]oxazines
A gold(I)‐catalyzed highly diastereo‐ and enantioselective intermolecular cycloaddition of oxime ethers with nitrones under mild conditions was developed, which provides an facile access to optically pure highly substituted pyrrolo[3,4‐d][1,2]oxazines. The salient features of this reaction include general substrate scope, high efficiency, high enantioselectivity, readily available starting materials
在温和条件下,金(I)催化了肟醚与硝酮的高度非对映异构和对映选择性分子间环加成反应,从而可以轻松获得光学纯的高度取代的吡咯并[3,4- d ] [1,2]恶嗪。该反应的显着特征包括一般的底物范围,高效率,高对映选择性,易于获得的起始原料以及可商购的配体的使用。
Gold(I)-Catalyzed Diastereoselective Domino Reactions of 2-(1-Alkynyl)alk-2-en-1-one Oxime Ethers with α,β-Unsaturated Imines Consisting of 1,2-Alkyl Migration
作者:Mei Zhang、Junliang Zhang
DOI:10.1002/ijch.201300070
日期:2013.11
A formal gold(I)‐catalyzed diastereoselective [4+3] cycloaddition of oxime ethers with imines, consisting of 1,2‐alkyl migration under mild reaction conditions, has been developed; this provides facile access to a series of highly substituted trans‐pyrrolo[3,4‐c]azepines. This reaction is easily scaled up to the gram scale.
已经开发出一种正式的金(I)催化肟醚与亚胺的非对映选择性[4 + 3]环加成反应,该反应由在温和的反应条件下的1,2-烷基迁移组成;这提供了对一系列高度取代的反式-吡咯并[3,4- c ]氮杂环庚烷的便捷访问。该反应很容易放大到克级。
Access to functionalized alkynylcyclopropanes <i>via</i> reductive radical-polar crossover-based reactions of 1,3-enynes with alkyl radicals
作者:Beibei Zhang、Junfei Luo、Yewen Fang
DOI:10.1039/d2ob02155b
日期:——
radical-polar crossover process as a strategy, protocols dealing with the preparation of functionalized alkynylcyclopropanes have been successfully developed via the reactions of 1,3-enynes with alkylradicals. In addition to redox-neutral photocatalysis, nickel catalysis with zinc as the reductant is also an alternative to enable reactions of 1,3-enynes with redox-active N-hydroxyphthalimide esters