反应详情

A solution of (±)-trans-2-azido-cyclopentanol (1.27 g, 10.0 mmol) (Zhang, Z. da; Scheffold, R. Helv. Chim. Acta 1993, 76, 2602) in CH2Cl2 (14 mL) at 0° C. was treated successively with pyridine (0.88 mL, 10.9 mmol) and 4-nitro-benzenesulfonyl chloride (2.22 g, 10.0 mmol) and allowed to warm to room temperature slowly. The reaction was stirred for 4 d, during which additional pyridine (0.9 mL, 11 mmol) and 4-nitro-benzenesulfonic acid (2.2 g, 10 mmol) was added, and partitioned between CH2Cl2 and 1 N HCl. The aqueous phase was extracted with CH2Cl2 and the extracts were washed with saturated NaHCO3, dried and concentrated. Chromatography of the residue with 10:1–4:1 hexanes:EtOAc gave the product (2.63 g, 84%) as a yellow oil: 1H NMR δ 1.61–1.90 (m, 4H), 2.00–2.16 (m, 2H), 3.96 (m, 1H), 4.72 (m, 1H), 8.14 (m, 2H), 8.43 (m, 2H).

1. additionwas added
2. custompartitioned between CH2Cl2 and 1 N HCl
3. extractionThe aqueous phase was extracted with CH2Cl2
4. washthe extracts were washed with saturated NaHCO3
5. customdried
6. concentrationconcentrated