Directed γ-C(sp<sup>3</sup>)–H Alkylation of Carboxylic Acid Derivatives through Visible Light Photoredox Catalysis
作者:Dian-Feng Chen、John C. K. Chu、Tomislav Rovis
DOI:10.1021/jacs.7b09306
日期:2017.10.25
Visible light photoredox catalysis enables direct γ- C(sp3)-H alkylation of saturated aliphatic carbonyl compounds. Electron-deficient alkenes are used as the coupling partners in this reaction. Distinguished site selectivity is controlled by the predominant 1,5-hydrogen atom transfer of an amidyl radical generated in situ.
Application of a novel design paradigm to generate general nonpeptide combinatorial scaffolds mimicking beta turns: synthesis of ligands for somatostatin receptors
作者:Dona Chianelli、Yong-Chul Kim、Dmitriy Lvovskiy、Thomas R Webb
DOI:10.1016/j.bmc.2003.08.022
日期:2003.11
practical method for the design of scaffolds exhibiting drug-like properties that are suitable for the display of peptide pharmacophores. The synthesis of various synthons of 7'-hydroxy-2',3'-dihydro-1'H,2H,5H-spiro[imidazolidine-4,4'-quinoline]-2,5-dione (1) and methods for the introduction of several mimics of amino acid side-chains are described. This method is exemplified by derivatives that show
Palladium-Catalyzed Base-Promoted Arylation of Unactivated C(sp<sup>3</sup>)-H Bonds by Aryl Iodides: A Practical Approach To Synthesize β-Aryl Carboxylic Acid Derivatives
A highly efficientprotocol for the β-arylation of carboxylicamides by aryl iodides under PdCl2(CH3CN)2/CsOAc catalysis was developed. This method was found to tolerate a broad scope of substrates and was successfully employed in the preparation of a variety of β-aryl α-amino and γ-amino acid derivatives. The utility of this method was further illustrated in the synthesis of the psychotropic drug
Palladium-Catalyzed Direct Ethynylation of C(sp<sup>3</sup>)–H Bonds in Aliphatic Carboxylic Acid Derivatives
作者:Yusuke Ano、Mamoru Tobisu、Naoto Chatani
DOI:10.1021/ja206002m
日期:2011.8.24
The first catalytic alkynylation of unactivatedC(sp(3))-H bonds has been accomplished. The method allows for the straightforward introduction of an ethynyl group into aliphatic acid derivatives under palladium catalysis. This new reaction can be applied to the rapid elaboration of complex aliphatic acids, for example, via azide/alkyne cycloaddition.
Mannich‐Type Condensation and Domino Quinazolinone‐Amidine Rearrangement Affords Ring‐Fused Mackinazolinones with Anti‐Amoebic Activity
作者:Matthew S. Lish、Jillian E. Milanes、Kyana M. Sanders、Ilia A. Guzei、James C. Morris、Jennifer E. Golden
DOI:10.1002/adsc.202300994
日期:2023.12.19
has been developed. A Mannich-type reaction between quinazolin-4-ones and N-Cbz propanal in the presence of AgOTf afforded quinazolinones (19–94% isolated yield) bearing a newly formed heterocycle with an alkylamine appendage that, upon N-Cbz deprotection and basification, triggered a domino rearrangement to afford 45 separable, ring-fused products. Several compounds inhibited growth of Naegleria fowleri