1: 15 percent / NaN3, glacial HOAc / butan-1-ol / Heating 2: 1) sec-butyllithium, tetramethylethylenediamine / 1) THF, cyclohexane, -35 to 30 deg C, 2) to room temperature View Scheme

1: HCl 2: 1) sec-butyllithium, tetramethylethylenediamine / 1) THF, cyclohexane, -35 to 30 deg C, 2) to room temperature View Scheme

N,N,N',N,-tetramethylethylenediamine; sec.-butyllithium 1) THF, cyclohexane, -35 to 30 deg C, 2) to room temperature; Yield given. Multistep reaction;