Application of FSO2N3 in preparation of azide

The invention discloses an application of FSO2N3 in the preparation of azide. An FSO2N3 compound is used for carrying out diazo transfer, so that corresponding azide (R-N3, Ar-N3 or RSO2-N3) can be quickly and safely prepared at a high yield from primary amino compounds (including a primary alkylamine compound (R-NH2), a heteroaryl amine compound (Ar-NH2) or a sulfonamide compound (RSO2-NH2)). Anoperation is simple and efficient.