4-nitrophthaloyl nitrogen-oxygen heterocyclic compound as well as preparation method and application thereof

The invention discloses a 4-nitrophthaloyl nitrogen-oxygen heterocyclic compound and a preparation method thereof, and a method for preparing aza-crown ether by adopting the compound, and the preparation method comprises the following steps: (a) under the condition of air isolation, in a first reaction solvent, in the presence of a condensation reagent, adding a compound 6 into a compound 1, and reacting at 0-100 DEG C for 2-48 hours to obtain a compound 2; wherein the molar ratio of the compound 1 to the compound 6 is 1: (1-1.5); and (b) adding triphenylphosphine and a coupling agent into the compound shown in the formula 2 and the compound shown in the formula 3 in a second reaction solvent, and reacting at-20-100 DEG C for 2-24 hours according to the molar ratio of the compound shown in the formula 2 to the compound shown in the formula 3 of 1: (1-1.5). The method is low in cost and high in yield, the synthesized aza-crown ether is high in purity, and the method is more suitable for the requirements of ind