反应详情

Diethyl azodicarboxylate (4.02 ml, 0.0.26 mol) was added to a solution of diethyl [4-(t-butyldimethylsilyloxy)-3-hydroxybutyl]phosphonate (7.9 g, 0.023 mol), N-hydroxyphthalimide (3.79 g, 0.023 mol) and triphenylphosphine (6.70 g, 0.026 mol) in dry tetrahydrofuran (100 ml). The mixture was stirred overnight at ambient temperature under a nitrogen atmosphere. The solvent was removed in vacuo and the residue dissolved in diethyl ether and kept at 4° C. for 24 hours. The mixture was filtered and the filtrate evaporated to dryness. The residue was chromatographed on silica gel (hexane-acetone 3:1 as eluant) to give the title compound as a pale yellow oil (7.9 g, 70%). IR:υmax (film) 2990, 2960, 2940, 2860, 1790, 1740, 1605, 1420, 1370, 1250, 1190, 1160, 1120, 1060, 1030, 970, 880, 840, 790, 700 cm-1. 1H NMR: δH (CDCl3) 0.0 (6H, s, SiMe2), 0.8 (9H, s, SiBut), 1.3 (6H, t, J=7Hz, (OCH2CH3)2), 1.78-2.4 (4H, m, CH2CH2P), 3.6-4.1 (7H, m, OCH2CH+(OCH2CH3)2), 7.65-7.95 (4H, m, aromatic H).

1. customThe solvent was removed in vacuo
2. dissolutionthe residue dissolved in diethyl ether
3. waitkept at 4° C. for 24 hours
4. filtrationThe mixture was filtered
5. customthe filtrate evaporated to dryness
6. customThe residue was chromatographed on silica gel (hexane-acetone 3:1 as eluant)