Process for production of 2-phosphated esters of ascorbic acid
First Claim
1. In an improved process for the production of 2-phosphated esters of ascorbic acid which comprises subjecting an ascorbic acid optionally protected at the 5- and 6-positions to phosphorylation, followed, if necessary, by removing any protecting group, the improvement is characterized by maintaining the concentration of the optionally protected ascorbic acid in a reaction mixture at less that 0.25M.
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Abstract
A process for the production of 2-phosphated esters of ascorbic acid by subjecting an ascorbic acid optionally protected at the 5- and 6-positions to phosphorylation with maintaining the concentration of the optionally protected ascorbic acid in a reaction mixture at less than 0.3 M and, if necessary, removing any protecting group is disclosed. 2-Phosphated ester of ascorbic acid can be produced with a good yield in an industrial scale by this process.
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Citations
11 Claims
- 1. In an improved process for the production of 2-phosphated esters of ascorbic acid which comprises subjecting an ascorbic acid optionally protected at the 5- and 6-positions to phosphorylation, followed, if necessary, by removing any protecting group, the improvement is characterized by maintaining the concentration of the optionally protected ascorbic acid in a reaction mixture at less that 0.25M.
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11. In an improved process for the production of 2-phosphated esters of ascorbic acid which comprises subjecting an ascorbic acid optionally protected at the 5- and 6-positions to phosphorylation, followed, if necessary, by removing any protective group, the improvement is characterized by maintaining the concentration of the optionally protected ascorbic acid in a reaction mixture at less than 0.25M, said optionally protected ascorbic acid being a compound selected from the group consisting of ascorbic acid, 5,6-O-isopropylidene ascorbic acid, 5,6-O-sec-butylidene ascorbic acid, 5,6-O-1-ethylbutylidene ascorbic acid, 5,6O-cyclopentylidene ascorbic acid and 5,6-O-cyclohexylidene ascorbic acid, and said phosphorylation being conducted by intermittently or continuously adding dropwise a mixture of said optionally protected ascorbic acid and a phosphorylating agent selected from the group consisting of phosphorus oxychloride, hydrates and alcoholates thereof, dichlorophosphoric acid and tetrachloropyrophosphoric acid to the reaction mixture in the presence of pyridine in an atmosphere of nitrogen gas or argon gas.
Specification