Cl[CH:2]1[CH2:8][CH:7]([CH:9]([CH3:11])[CH3:10])[CH2:6][CH2:5][NH:4][C:3]1=[O:12].[N-:13]=[N+:14]=[N-:15].[Na+].C(Cl)Cl>CS(C)=O.O>[N:13]([CH:2]1[CH2:8][CH:7]([CH:9]([CH3:11])[CH3:10])[CH2:6][CH2:5][NH:4][C:3]1=[O:12])=[N+:14]=[N-:15]3-Chloro-5-isopropyl-azepan-2-one (3.4 g, 18 mmol) and sodium azide (3.51 g, 53.9 mmol) were reacted in dry dimethyl sulfoxide (50 ml) overnight at 80° C. under an argon atmosphere. The reaction mixture was allowed to cool to r.t. diluted with water (200 ml) and extrated with CH2Cl2 (4×). The combined organic fractions were washed with water (3×), brine and dried (MgSO4) filtered and evaporated under reduced pressure. The crude yellow oil was purified over silica gel (ethyl acetate/n-heptane 1:2): yellow oil 2.6 g (70%); MS: m/e=197.4 (MH+)
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