Iron-Catalyzed C(sp3)–H Alkylation through Ligand-to-Metal Charge Transfer
作者:Tomislav Rovis、Yi Cheng Kang、Sean M. Treacy
DOI:10.1055/s-0040-1720388
日期:2021.10
FeCl3-catalyzed alkylation of nonactivated C(sp3)–H bonds. Photoinduced ligand-to-metal charge transfer at the iron center generates chlorine radicals that then preferentially abstract hydrogen atoms from electron-rich C(sp3)–H bonds distal to electron-withdrawing functional groups. The resultant alkyl radicals are trapped by electron-deficient olefins, and the catalytic cycle is closed by Fe(II) recombination
Efficient Synthesis of Polysubstituted 1,5-Benzodiazepinone Dipeptide Mimetics via an Ugi-4CR-Ullmann Condensation Sequence
作者:Robin Van Den Hauwe、Mathias Elsocht、Steven Ballet、Charlie Hollanders
DOI:10.1055/a-1545-2860
日期:2021.10
three-step synthesis towards 3-amino-1,4-benzodiazepin-2-one derivatives is presented. The versatile Ugi-4-component reaction (Ugi-4CR) and Boc deprotection is followed by a ligand-free Ullmann condensation. This protocol allows the rapid construction of a diverse array of substituted 1,5-benzodiazepinones. Since Ugi-based products are typically limited by their ‘inert’ C-terminal amides, the use of a convertible
An efficient method for <i>retro</i>-Claisen-type C–C bond cleavage of diketones with tropylium catalyst
作者:M. A. Hussein、V. T. Huynh、R. Hommelsheim、R. M. Koenigs、T. V. Nguyen
DOI:10.1039/c8cc07329e
日期:——
cleavage in this reaction is usually promoted by a number of transition-metal Lewis acid catalysts or organic Brønsted acids/bases. Herein we report a new convenient and efficient method utilizing the tropylium ion as a mild and environmentally friendly organocatalyst to mediate retro-Claisen-type reactions. Using this method, a range of synthetically valuable substances can be accessed via solvolysis of
Metal‐Free, Visible‐Light‐Induced Selective C−C Bond Cleavage of Cycloalkanones with Molecular Oxygen
作者:Hong Xin、Xin‐Hua Duan、Le Liu、Li‐Na Guo
DOI:10.1002/chem.202001032
日期:2020.9.10
A metal‐free, visible‐light‐induced oxidative C−C bond cleavage of cycloketones with molecular oxygen is described. Cooperative Brønsted‐acidcatalysis and photocatalysis enabled selective C−C bond cleavage of cycloketones to generate an array of γ‐, δ‐ and ϵ‐keto esters under very mild conditions. Mechanistic studies indicate that singlet molecular oxygen (1O2) is responsible for this transformation
描述了环酮与分子氧的无金属,可见光诱导的氧化CC键裂解。布朗斯台德酸催化和光催化的协同作用使得在非常温和的条件下环酮的选择性C-C键裂解产生了一系列γ-,δ-和β-酮酯。机理研究表明,单线态分子氧(1 O 2)是造成这种转变的原因。
FAAH INHIBITORS
申请人:Sprott Kevin
公开号:US20090118503A1
公开(公告)日:2009-05-07
Indole derivatives that are useful for treating pain, inflammation and other conditions are described. Certain of the compounds are benzyl derivatives and others are benzoyl derivatives. The compounds are substituted at least at the 3 position of the indole.