Methyl Glycolate → 1-o-Methyloxycarbonylmethyl-2,3,4,6-tetra-o-acetyl-glucopyranose

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The yields of the compounds of general formula I, which can be achieved with the process according to the invention, are good. For known compounds in which a comparison with the prior art is possible, they exceed the yields of the prior art. Thus, for example, (WO 96/35700), in the reaction of acetobromoglucose with glycolic acid methyl ester under the influence of mercury oxide and mercury(II) bromide according to Koenigs-Knorr, the 1-O-methyloxycarbonylmethyl-2,3,4,6-tetra-O-acetyl-glucopyranose is obtained with a yield of 60%. The saponification to the free acid would be connected with a further loss in yield. EP 882733 also describes the production of this compound, but without yield information. According to the process of the invention, the acid is also obtained in a two-stage process. Here, the yield is 78%, however (Example 24 of this application).

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