反应详情

A solution of cis-3-azido-4-(4-bromophenoxy)tetrahydrofuran (286.7 g, 1.01 mol) in tetrahydrofuran (1.25 L) was cooled to 0° C. and treated with triphenylphosphine (278 g, 1.06 mol). The reaction was allowed to warm to room temperature and stirred for 18 hours. Water (53 mL) was added and the reaction was stirred at room temperature for 66 hours. Solvent was removed under reduced pressure and the residue was mixed with diethyl ether. The supernatant was decanted and concentrated in vacuo, providing a residue, which was filtered through a short plug of silica gel (Gradient: 0% to 5% methanol in methylene chloride) to afford cis-4-(4-bromophenoxy)tetrahydrofuran-3-amine (155 g) and 366 grams of impure product. An acid/base extraction was carried out on the impure material, providing additional product (48.5 g). Total yield: 203.5 g, 0.788 mol, 68% over four steps. 1H NMR (300 MHz, CDCl3) δ 3.6 (m, 1H), 3.7 (m, 1H), 3.9 (m, 1H), 4.0 (m, 1H), 4.1 (m, 1H), 4.6 (m, 1H), 6.8 (m, 2H), 7.3 (m, 2H).

1. stirringthe reaction was stirred at room temperature for 66 hours
2. customSolvent was removed under reduced pressure
3. additionthe residue was mixed with diethyl ether
4. customThe supernatant was decanted
5. concentrationconcentrated in vacuo
6. customproviding a residue, which
7. filtrationwas filtered through a short plug of silica gel (Gradient: 0% to 5% methanol in methylene chloride)