Potassium Hydroxide → Boc-D-Glu-OH

Participants

Reaction Steps

14.7 g (0.1 Mol) of H-D-Glu-OH was dissolved in 200 ml of distilled water, and the pH was adjusted to 10.2 with 0.1M potassium hydroxide. 33.0 g (0.3 Mol) of BOC2O in dioxane was added with intensive mixing. The pH was controlled using pH-stat. After completion of the reaction, the mixture was transferred to a separating funnel, and extraction was carried out from the alkaline solution with ethyl acetate (3×150 ml). The pH of the aqueous phase was adjusted to 3.0 using 0.2% sulphuric acid, and Boc-D-Glu-OH was extracted from the organic phase (3×200 ml). The organic phase was washed three times with 200 ml of Na2SO4 saturated solution to neutral pH, and dried over Na2SO4, and evaporated to oil under vacuum. The yield was 16.7 g (68%).

Provenance & Evidence