“…Due to its easy availability, low costs, moisture stability, and low toxicity, ZrOCl 2 ·8H 2 O is effectively used as a green catalyst in organic reactions, such as synthesis of functionalized piperidine scaffolds, [34] synthesis of 5-amino-1-aryl-1H-tetrazoles, [35] synthesis of bis-β-amino ketones, [36] synthesis of homoallylic alcohols and amines, [37] synthesis of enaminones and enamino esters, [38] synthesis of N-substituted pyrroles, [39] synthesis of α-aminophosphonates, [40] synthesis of 2-substituted benzothiazoles, [41] synthesis of 3,4-dihydropyrimidin-2(1H)-ones, [42] synthesis of 1,8-dioxo-octahydroxanthene, [43] synthesis of imidazolines and bisimidazolines, [44] synthesis of 2-aryloxazolines and bisoxazolines, [45] synthesis of isobenzofuran-1(3H)-ones, [46] synthesis of β-acetamido ketones, [47] synthesis of hexahydroquinoline derivatives, [48] synthesis of αaminonitriles, [49] N-acylation of lactams, [50] synthesis of Nsubstituted pyrrole derivatives. [51] Nowadays, multicomponent reactions (MCRs) have received special attention in organic synthesis as they can produce target products in a single operation without isolating the intermediates and thus reducing the reaction times and energy. [52][53][54][55][56][57][58] In continuation of our interest in finding new environmentally benign methods for the synthesis of various compounds, [59][60][61][62][63][64][65] herein we report for the first time the one-pot three-component synthesis of [1,3]oxazino [5,6c]quinolin-5-one derivatives using ZrOCl 2 ·8H ...…”