(S)-beta-Benzoyloxy-gamma-butyrolactone → 3-O-benzoyl-2-deoxy-threose

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of 101 (0.780 g, 3.8 mmol) in 13 mL dry THF was slowly dropwise added 1.0 M diisopropyl aluminiumhydride (4.7 mL, 4.7 mmol) in toluene at −78° C. The reaction mixture was stirred at −78° C., and as soon as the starting material was completely consumed (TLC, 2 hours), methanol (2 mL) was slowly added in order to quench the reaction. The cooling bath was removed, 15 mL of a saturated aqeous sodium potassium tartrate solution and 25 mL of EtOAc were added and the mixture stirred vigorously for 3 hours. The organic layer was washed with water and brine, and concentrated under vacuo. The residue was purified by chromatography on a silica gel column (n-hexane/EtOAc=8:2) to afford 102 (590 mg, 2.8 mmol) as a colorless oil, in 75% yield, which was characterized as follows:

Herkunft & Nachweise