反应详情

To a mixture of crude ethyl D-glucopyranoside (578 g, 2.78 mol, prepared according to example 10) and dodecanoic acid (751 g, 3.75 mol) in a stirred batch reactor at 70° C. was added immobilized lipase derived from Candida antarctica (29 g, prepared as described in Danish patent application No. 3250/88). Stirring was continued under reduced pressure (0.05 bar) and the progress of the ester synthesis was monitored by HPLC. After 23 hours the enzyme was removed by filtration (at 70° C.). Excess fatty acid was removed by repeated molecular distillation (105° C., 0.04 mbar) yielding 96% (1050 g) of crude product along with 2% ethyl D-glucoside and 2% of a mixture of diesters (HPLC analysis). The crude product was purified by chromatography Identification by 1H NMR-analysis showed a 1:1 mixture of α and β anomers (tables 42/46).

1. additionwas added immobilized lipase
2. customprepared
3. customAfter 23 hours the enzyme was removed by filtration (at 70° C.)
4. customExcess fatty acid was removed
5. distillationdistillation (105° C., 0.04 mbar)