铑(III)催化的带有苯氧基乙酰胺的酰基载体蛋白的立体选择性碳-碳键裂解:亲核导向基团的关键作用

Rh(III)-Catalyzed Stereoselective C-C Bond Cleavage of ACPs with -Phenoxyacetamides: The Critical Role of the Nucleophilic Directing Group.

作者信息

Singh Anurag, Dey Arnab, Volla Chandra M R

机构信息

Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.

出版信息

J Org Chem. 2021 Aug 6;86(15):10474-10483. doi: 10.1021/acs.joc.1c01135. Epub 2021 Jul 23.

Abstract

Rh(III)-catalyzed redox-neutral chemodivergent coupling of -phenoxyacetamides and alkylidenecyclopropanes (ACPs) has been documented. The reaction proceeds C-H activation, regioselective migratory insertion and stereoselective β-carbon elimination followed by β-hydride elimination, resulting in -dienylation of phenols in nonpolar solvents, whereas [3 + 2]-annulation leading to dihydrobenzofurans was realized in polar fluorinated solvents. It was observed that the nucleophilic directing group controls the elimination of β-carbon and so plays a vital role for achieving high stereoselectivities. The synthetic utility of the dienylation and annulation was demonstrated by carrying out gram scale reactions and further derivatization.

摘要

已报道铑(III)催化的苯氧基乙酰胺与亚烷基环丙烷(ACPs)的氧化还原中性化学发散偶联反应。该反应通过C-H活化、区域选择性迁移插入和立体选择性β-碳消除,随后进行β-氢消除,在非极性溶剂中生成酚的双烯基化产物,而在极性氟化溶剂中实现了生成二氢苯并呋喃的[3+2]环化反应。据观察,亲核导向基团控制β-碳的消除,因此对实现高立体选择性起着至关重要的作用。通过进行克级反应和进一步衍生化,证明了双烯基化和环化反应的合成实用性。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索