Rhodium(III)-Catalyzed C–H Olefination for the Synthesis of <i>ortho</i>-Alkenyl Phenols Using an Oxidizing Directing Group
作者:Yangyang Shen、Guixia Liu、Zhi Zhou、Xiyan Lu
DOI:10.1021/ol4014188
日期:2013.7.5
By using an oxidizing directinggroup, a mild, efficient Rh(III) catalyzed C–H olefination reaction between N-phenoxyacetamides and alkenes was developed. This reaction provided a straightforward way for the synthesis of ortho-alkenyl phenols, and the directinggroup is traceless in the product.
Cascade Synthesis of 3-Alkylidene Dihydrobenzofuran Derivatives via Rhodium(III)-Catalyzed Redox-Neutral C–H Functionalization/Cyclization
作者:Zhi Zhou、Guixia Liu、Yan Chen、Xiyan Lu
DOI:10.1021/acs.orglett.5b03060
日期:2015.12.4
An efficient rhodium(III)-catalyzed coupling reaction of N-phenoxyacetamides with propargyl carbonates to yield 3-alkylidene dihydrobenzofuran derivatives via C–H functionalization/cascade cyclization has been developed. This transformation represents a redox-neutral process and features the formation of three new bonds under mild conditions.
Rhodium(III) Catalyzed Carboamination of Alkenes Triggered by C–H Activation of <i>N</i>-Phenoxyacetamides under Redox-Neutral Conditions
作者:Zhiyong Hu、Xiaofeng Tong、Guixia Liu
DOI:10.1021/acs.orglett.6b00616
日期:2016.4.1
N-Alkoxyacrylamides are coupled with N-phenoxyacetamides by RhIII catalysis through C–H functionalization and amido group transfer under external oxidant-free conditions, which affords acyclic alkene carboamination products in an atom-economical way. Mechanisticinsight into this transformation indicates the amide group in N-alkoxyacrylamide plays a critical role in this C–C/C–N bond formation reaction
selectively construct benzofuran and dihydrobenzofuro[2,3-d]oxazole derivatives has been successfully established by means of base-controlled cyclization of N-phenoxyamides with 1-[(triisopropylsilyl)ethynyl]-1,2-benziodoxol-3(1H)-one (TIPS-EBX). N-phenoxyamides as multitasking reagents have triggered two different cascade reaction sequences. This is the first example of using TIPS-EBX for the transformation
通过用1-[((三异丙基甲硅烷基)乙炔基] -1,2-苯并恶多酚-3对N-苯氧酰胺进行碱控制的环化,成功建立了选择性构造苯并呋喃和二氢苯并呋喃[2,3- d ]恶唑衍生物的有效方法。(1 H)一(TIPS-EBX)。N-苯氧酰胺作为多任务试剂已触发了两个不同的级联反应序列。这是使用TIPS-EBX在无金属条件下将C(sp)转换为C(sp 2)或C(sp 3)的第一个示例。
Redox-neutral rhodium(<scp>iii</scp>)-catalyzed divergent synthesis of tetrasubstituted 1,3-enynes and alkynylated benzofurans
With the assistance of the acetamido directing group (DG), a rhodium-catalyzedC–Halkenylation/DG migration cascade for the synthesis of tetrasubstituted 1,3-enynes from N-phenoxyacetamides and 1,3-diynes has been achieved in this work. Alternatively, a rhodium-catalyzed [3 + 2] annulation for the synthesis of alkynylated benzofurans from the same set of substrates has also been achieved by simply