Yield:33173-55-6 98%

Reaction Conditions:

with fluorosulfonyl azide;potassium hydrogencarbonate in tert-butyl methyl ether;water;N,N-dimethyl-formamide at 20; for 0.0833333 h;

Steps:

General procedure for the preparation of the isolated azide compounds.

General procedure: To a 50-ml glass round-bottom flask was added sequentially the primary amine 2 (1.0 mmol; aliphatic, aromatic or heteroaromatic; as free naked amine or as HCl, MsOH, TsOH or tartrate salt), FSO₂N₃ solution (containing 1.0 mmol FSO₂N₃, approximately 200 mM in DMF/MTBE 1:1, v/v, approximately 5 ml, volume adjusted according to the concentration; prepared according to the above procedure and diluted with equal volume of DMF) and aqueous KHCO₃ solution (3.0 M, 1.33 ml, containing 4.0 mmol KHCO₃). The reaction mixture was stirred for 5 min at room temperature, while monitoring by LC-MS. After completion, EtOAc (40 ml) was added and the mixture was washed sequentially with brine (60 ml × 6), water (60 ml × 2) and brine (60 ml), dried over Na₂SO₄, concentrated by rotary evaporation and dried under vacuum to afford the azide product 3. For products containing acidic functional groups, this extraction process was modified with acidified aqueous phase (acidified with aqueous HCl). Detailed procedures and the various modifications, as well as the characterization data for each compound, can be found in Supplementary Information 1.

References:

Meng, Genyi;Guo, Taijie;Ma, Tiancheng;Zhang, Jiong;Shen, Yucheng;Sharpless, Karl Barry;Dong, Jiajia [Nature,2019,vol. 574,# 7776,p. 86 - 89]