[EN] LIGAND-CONTROLLED C(SP3)-H ARYLATION AND OLEFINATION IN SYNTHESIS OF UNNATURAL CHIRAL ALPHA AMINO ACIDS<br/>[FR] ARYLATION COMMANDÉE PAR LIGAND DE C(SP3)-H ET OLÉFINATION UTILISABLES DANS LE CADRE DE LA SYNTHÈSE D'ACIDES ALPHA-AMINÉS CHIRAUX NON NATURELS
申请人:SCRIPPS RESEARCH INST
公开号:WO2015131100A1
公开(公告)日:2015-09-03
The use of ligands to tune the reactivity and selectivity of transition metal-catalysts for C(-sp3)-H bond functionalization is a central challenge in synthetic organic chemistry. Herein, we report a rare example of catalyst-controlled C(sp3)-H arylation using pyridine and quinoline derivatives: the former promotes exclusive monoarylation, whereas the latter activates the catalyst further to achieve diarylation. Successive application of these ligands enables the sequential diarylation of a methyl group in an alanine derivative with two different aryl iodides, affording a wide range of β-Ar-p-Ar ' -cc-amino acids with excellent levels of diastereoselectivity (d.r. > 20:1). Both configurations of the β-chiral center can be accessed by choosing the order in which the aryl groups are installed. The use of a quinoline derivative as a ligand also enables C(sp3)-H olefination of a protected alanine.
SYNTHESIS OF HYPERVALENT IODINE REAGENTS WITH DIOXYGEN
申请人:The Texas A&M University System
公开号:US20190002487A1
公开(公告)日:2019-01-03
Methods of synthesis of hypervalent iodine reagents and methods for oxidation of organic compounds are disclosed.
揭示了高价碘试剂的合成方法和有机化合物氧化的方法。
Oxidase catalysis via aerobically generated hypervalent iodine intermediates
作者:Asim Maity、Sung-Min Hyun、David C. Powers
DOI:10.1038/nchem.2873
日期:2018.2
autoxidation to aerobically generate hypervalentiodinereagents for a broad array of substrate oxidation reactions. The use of aryl iodides as mediators of aerobic oxidation underpins an oxidase catalysis platform that couples substrate oxidation directly to O2 reduction. We anticipate that aerobically generated hypervalentiodinereagents will expand the scope of aerobic oxidation chemistry in chemical
Effects of Aromatic Substituents of Electrochemically Generated Hypervalent Iodine Oxidant on Oxidation Reactions
作者:Shigeru Nishiyama、Yoshiharu Amano
DOI:10.3987/com-08-11331
日期:——
Phenolic oxidation of 4-hydroxyphenylpropionic acid (5) with electrochemically generated hypervalent iodine oxidant, was performed using a variety of iodobenzene derivatives. Iodobenzene derivatives carrying electron-deficient aromatic moieties showed oxidant activity comparable to that of bis(2,2,2-trifluoroethoxy)phenyliodine(III) 1, and better than those carrying electron-donating groups with the
First hypervalent iodine(<scp>iii</scp>)-catalyzed C–N bond forming reaction: catalytic spirocyclization of amides to N-fused spirolactams
作者:Toshifumi Dohi、Akinobu Maruyama、Yutaka Minamitsuji、Naoko Takenaga、Yasuyuki Kita
DOI:10.1039/b616510a
日期:——
A protic solvent, 2,2,2-trifluoroethanol (CF3CH2OH), was successfully introduced into hypervalent iodine(III)-involved catalytic cycles as an effective solvent, and the first iodoarene-catalyzed intramolecular carbonânitrogen bond forming reaction was achieved under strong acid-free and mild conditions.