PROBLEM TO BE SOLVED: To provide a method for producing a [1-13C]DOX (1-deoxy-D-xylulose) synthesizable in a large amount and to obtain a DOX derivative that is stable and efficiently taken by a cell.
SOLUTION: The [1-13C]DOX represented by formula (III) (R1, R2and R3are the same or different and are each a hydroxy-protecting group) is obtained by reacting an amide compound represented by formula (I) with a13C-methyl Grignard reagent to give a ketone compound represented by formula (II) and then removing a hydroxy-protecting group of the ketone compound (II). In this extremely efficient production method, a13C isotope is introduced into carbon at the 1-position of DOX and deprotection reaction is carried out by hydrogenation. Since the final deprotection reaction is carried out in a homogeneous system, isolation of relatively unstable and water-soluble [1-13C]DOX (III) is performed by a simple operation of only concentration and the method has high general-purpose properties.
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