反应详情

1.0 g (4 mmol) of 6-O-benzoylgalactal is taken up in about 20-25 ml of DME and 10-15 ml of vinyl chloroacetate and stirred with 1 g of lipase from Pseudomonas spec. (lipase P, Amano) at room temperature for about 5-7 h. Filtering off the reusable enzyme, concentration of the solution in vacuo and chromatography on silica gel (ether/hexane 1:1) or crystallization result in 6-O-benzoyl-3-O-chloroacetyl-galactal in 80% yield (1050 mg).

1. filtrationFiltering off the reusable enzyme, concentration of the solution in vacuo and chromatography
2. customon silica gel (ether/hexane 1:1) or crystallization
3. customresult in 6-O-benzoyl-3-O-chloroacetyl-galactal in 80% yield (1050 mg)