Iodine-Promoted Oxidative Amidation of Terminal Alkenes - Synthesis of α-Ketoamides, Benzothiazoles, and Quinazolines
作者:Ramesh Deshidi、Shekaraiah Devari、Bhahwal Ali Shah
DOI:10.1002/ejoc.201403547
日期:2015.3
A novel metal-free strategy for oxidative amidation of terminal alkenes by using I2/DMSO for the synthesis of α-ketoamides has been developed. Intriguingly, the use of tert-butylhydroperoxide (TBHP) as co-oxidant can facilitate the synthesis of α-ketoamides at room temperature without any solvent, thereby making it a green protocol. The reaction with primary amines can be easily achieved by using SeO2
Benzoylquinazolinonederivatives 3a–n were synthesized via a simple one‐step reaction, and evaluated for in vitro α‐glucosidase inhibitory activity. Compounds 3d, 3f–g, 3i, and 3m–n showed more inhibitory activity than standard drug acarbose (IC50 = 750.0 ± 1.5 μM), and among them, compound 3d displayed the highest α‐glucosidase inhibitory activity (IC50 = 261.6 ± 0.1 μM). The kinetic analysis of the
three‐component reaction of isatoic anhydride, primary aliphatic or aromaticamines, and acetophenones leading to densely substituted 3‐substituted 2‐aroylquinazolin‐4(3H)‐ones is reported. The key step involves a cascade reaction of selective oxidation of the methyl group of the acetophenones, followed by a condensation with anthranilamides. The scope of the reaction is applicable to the synthesis of tryptanthrin
An efficient one-pot synthetic protocol has been proposed for the synthesis of luntonin F from easily available starting materials. Through a rational logical design, multifundamental reactions (iodination, Kornblum oxidation, and annulation) were assembled in one-pot. The developed approach can efficiently synthesize luntonin F and a diversity of analogues.