反应详情

To a solution of 66 mg (0.25 mmol) of triphenylphosphine and 30 μL (0.25 mmol) of phenethyl alcohol in 3 mL of anhydrous CH2Cl2 was added 58 mg (0.25 mmol) of di-tert-butyl azodicarboxylate. The resulting solution was stirred at RT for 5 minutes and was then treated with a solution of 50 mg (0.084 mmol) of (3R,3aS,6aR)hexahydrofuro[2,3-b]furan-3-yl (1S,2R)-3-[(1,3-benzodioxol-5-ylsulfonyl)(isobutyl)amino]-2-hydroxy-1-(4-hydroxybenzyl)propylcarbamate in 2 mL of CH2Cl2. After stirring at RT for 1.5 hours the solution was concentrated to dryness and the residue purified by flash chromatography (SiO2, 4:6 hexane/EtOAc) to give the desired product as a white foam in 72% yield, 1H NMR (CDCl3): 7.34-7.17 (m, 6H), 7.15 (s, 1H), 7.07 (d, 2H), 6.86 (d, 1H), 6.78 (d, 2H), 6.03 (s, 2H), 5.61 (d, 1H) 4.98 (m, 1H), 4.86 (d, 1H), 4.09 (t, 2H), 3.92 (m, 1H), 3.84-3.56 (m, 6H), 3.17-3.01 (m, 3H), 3.00-2.81 (m, 4H), 2.80-2.64 (m, 2H), 1.78 (m, 1H), 1.56 (m, 1H), 1.47 (m, 1H), 0.91 (d, 3H), 0.85 (d, 3H). MS(ESI): 697(M+H).

1. stirringAfter stirring at RT for 1.5 hours the solution
2. concentrationwas concentrated to dryness
3. customthe residue purified by flash chromatography (SiO2, 4:6 hexane/EtOAc)