7-Fluoro-4-nitrobenzo-2-oxa-1,3-diazole → 2-Nbdlg

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In a brown flask, L-glucosamine hydrochloride (40.0 mg) and NaHCO3 (26.0 mg) were placed and dissolved in water (800 μl). A solution in which 4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F) (92.0 mg) was dissolved in methanol (4.0 ml) was added thereto, and under an argon atmosphere, the resulting mixture was stirred for 2 hours at a bath temperature of 37° C. Thereafter, the mixture was stirred at room temperature for an additional 40 minutes. Methanol was removed by concentration under reduced pressure, and the resulting precipitates (unnecessary substances derived from NBD-F) were removed by filtration. The precipitates were washed with water, and the filtrate and the washing solution were combined, followed by purification by HPLC. A target fraction was collected and lyophilized, whereby a target product was obtained (yield: 48.7 mg, yield ratio: 76%).

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