## 1 Introduction  
Oxidative cleavage of unsaturated hydrocarbons is one of the most significant and efficient approaches to produce carbonyl compounds in organic chemistry, petrochemical industry as well as the conversion of biomass [1; 2; 3; 4]. Aldehydes and ketones are important precursors to acids and alcohols as well as widely used in pharmaceutical, agriculture and most importantly in the fine chemical industry. The direct oxidative cleavage of olefins is still a challenge and greatly dependent on the use of conventional methods, for instance using ozone [5; 6; 7; 8], KMnO\({}_{4}\)[9; 10], oxone [11; 12], NaIO\({}_{4}\)[13], OsO\({}_{4}\)[14], high valance I\({}_{2}\)[15; 16], \(m\)-chloroperbenzoic acid, etc. [17; 18]. However, these methods suffer from the long reaction period, over oxidation, low selectivity, limited substrate scope, poor functional group tolerance and environment unfriendliness. There is need for development of environment benign synthetic methodologies, procedures not requiring use of hazardous materials and expensive reagents. In order to match the request of green chemistry some methodologies were developed for the oxidation of alkenes using the palladium catalyst under high pressure of oxygen [19]. Our group has also developed several metal-free oxidative methodologies [20; 21; 22]. Although these methodologies show progress towards oxidative cleavage of unsaturated hydrocarbons, nevertheless, there is still much room for the development of synthetic methodologies that provide the generality of substrate scope for the synthesis of fine chemical building blocks. Quinazoline heterocycles are an important class of fundamental building blocks in modern organic synthesis with recognized importance in natural products, bioactive compounds and pharmaceutical industry. A broad range of medicinal properties are reported for quinazolinones, such as anticancer [23; 24; 25; 26; 27], antibacterial [28; 29; 30], antifungal [31; 32; 33; 34; 35], antimalarial [36], antiviral [37; 38] as well as anti-microbial cholinesterase inhibitors [39; 40], making quinazoline a privileged class of N-containing heterocyclic scaffolds (Figure 1). Due to diverse biological applications in pharmaceutical industry numerous synthetic methodologies were developed for the synthesis of quinazolinones [41; 42; 43; 44; 45; 46; 47; 48; 49; 50; 51; 52; 53; 54; 55; 56; 57; 58]. These methods furnish the quinazolinones through reactions of readily available anthranilamide (2-aminobenzamide) with aldehydes, alcohols, esters, carboxylic acids, methyl arenes and amines under harsh reaction conditions in the presence of transition metals, etc. [41; 42; 43; 44; 45; 46; 47; 48; 49; 50; 51; 52; 53; 54; 55; 56; 57; 58]. Despite a high number of synthetic methodologies in literature, there is not much known for the synthesis of quinazolinones via oxidative reactions of 2-aminobenzamide with industrially important unsaturated hydrocarbons, i.e., olefins. Recent examples of oxidation-annulation reactions of 2-aminobenzamide and olefins were discovered by [PERSON] et al. [59] and [PERSON] et al [60] using transition metals Pd-ligand and Ru-cluster/ceria/CO respectively (Figure 2). More recently, [PERSON] et al. [61] has reported metal-free, iodine catalyzed reactions to synthesize quinazolinones from \(o\)-aminobenzamide and alkynes/alkenes (Figure 2). Furthermore, a very interesting discovery, metal and catalyst free electrochemical synthesis of quinazolinones from \(o\)-aminobenzamide and alkenes was reported by [PERSON] et al. [62] (Figure 2). Nevertheless, most of the reported work depend on expensive metals, ligands, higher temperature and special equipment, etc. which, as a result, limit the synthesis of biologically active compounds because of the presence of metal impurities in the products. Therefore, a significant need for improvement of environmentally benign methodologies for the preparation of quinazolinones under metal-based-catalyst free reaction conditions is still needed.