New short step general synthesis of isobenzofuran-1(3H)-ones (phthalides) based on a single or double β-scission of alkoxyl radicals generated from 1-ethyl-benzocyclobuten-1-ols and from 1,3-dihydroisobenzofuran-1-ols; synthesis of some natural phthalides
New general methods are described for the synthesis of phthalides, 3-monosubstituted, and 3,3-disubstituted phthalides including naturally-occurring phthalides such as pierardine based on a regioselective single or double β-scission of the alkoxyl radicals generated by the photolysis of the hypoiodites of 1-ethyl benzocyclobuten-1-ols or 1,2-catacondensed benzocyclobuten-1-ols or 1,3-dihydro-1,3-a
A simple new method for the synthesis of phthalides and their 3-alkyland 3,3′-spiroalkyl derivatives including (±)-3-butylphthalide, a racemic form of a constituent of celery oil, through the β-scission of alkoxyl radicals generated from hypoiodites of benzocyclobutenols by the photolysis, is described.
Visible Light-Promoted Magnesium, Iron, and Nickel Catalysis Enabling C(sp<sup>3</sup>)–H Lactonization of 2-Alkylbenzoic Acids
作者:Sasa Li、Mincong Su、Jie Sun、Kunjun Hu、Jian Jin
DOI:10.1021/acs.orglett.1c01984
日期:2021.8.6
patterns could be transformed into the corresponding phthalide products. Based on the mechanistic experimentation and reported prior studies, a possible mechanism for the benzylic oxidative lactonization reaction was proposed with the hypothetic photoactive ternary complex formed between the 2-alkylbenzoic acid substrate, magnesium ion, and bromate anion.
CHEMOSELECTIVE METHYLENE HYDROXYLATION IN AROMATIC MOLECULES
申请人:The Board of Trustees of the University of Illinois
公开号:US20200087331A1
公开(公告)日:2020-03-19
A chemoselective and reactive Mn(CF
3
-PDP) catalyst system that enables for the first time the strategic advantages of late-stage aliphatic C—H hydroxylation to be leveraged in aromatic compounds. This discovery will benefit small molecule therapeutics by enabling the rapid diversification of aromatic drugs and natural products and identification of their metabolites.
Oxidative Kinetic Resolution of Cyclic Benzylic Ethers
作者:Shutao Sun、Yingang Ma、Ziqiang Liu、Lei Liu
DOI:10.1002/anie.202009594
日期:2021.1.4
manganese‐catalyzed oxidative kinetic resolution of cyclic benzylic ethersthrough asymmetric C(sp3)−H oxidation is reported. The practical approach is applicable to a wide range of 1,3‐dihydroisobenzofurans bearing diverse functional groups and substituent patterns at the α position with extremely efficient enantiodiscrimination. The generality of the strategy was further demonstrated by efficient oxidative kinetic