Oxidative Dehydrogenation Strategy for the Synthesis of Nitrogen Heterocylces

Abstract

The research work which forms the content of this thesis entitled Oxidative dehydrogenation strategy for the synthesis of nitrogen heterocycles was initiated on January 2014 under the supervision of Dr.Subhabrata Sen, Department of Chemistry, School of Natural Sciences, Shiv Nadar University, Gautam Buddha Nagar, Uttar Pradesh, India, 201314. The primary objective of this present work is to develop synthetic procedures for the construction of biologically important nitrogen heterocycles such as quinazoline, benzimidazole, and#61538;-carboline, benzothiazole by employing different oxidant in a sustainable way. The thesis comprises of four chapters after the general discussion on the different oxidative dehydrogenation procedure. Chapter-1 describes N-bromosuccinimide promoted synthesis of and#61538;-carbolines and 3,4-dihydro-and#61538;-carbolines from tetrahydro-and#61538;-carbolines. Chapter-2 of this thesis involves o-iodoxybenzoic acid mediated tandem synthesis of quinazolines and dihydroquinazolines from 2-aminobenzylamine and aldehydes. Chapter-3 involves an oxone mediated tandem synthesis of benzimidazolesvia a ring distortion strategy. Chapter-4 describes anhydrous cerium chloride catalyzed, 2-iodoxybenzoic acid mediated oxidative dehydrogenation of multiple heterocycles at room temperature.