Hydrochloric Acid → AO 128

Participants

Reaction Steps

To a solution of 5 mmol of valiolone and 5 mmol of 2-amino-1,3-propanediol in 25 mL DMF or methanol is added a catalytic amount of HCl. After 1 hour at room temperature, 2.5 mmol of solid Na(CN)BH3 is added and the reaction mixture is stirred over night at room temperature. The reaction mixture is then concentrated under reduced pressure and the residue is dissolved in water and applied to a Dowex 50 (H+) column. The column is washed with water and the product is eluted with 0.5 N NH4OH. After concentrating the eluate, the residue is dissolved in water and applied successively first to a Amberlite CG-50 (NH4+) or Diaion WK-100 (NH4+) and then a Dowex 1 (OH-) column and each time the product is eluted with water to give voglibose.

Provenance & Evidence