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0 °C

5-Chloro-2-(methylsulfonyl)-7-morpholinothiazolo[4,5-d]pyrimidine was slurried in dry methanol/tetrahydrofuran (1:10). The solution was cooled to 0° C. under nitrogen and sodium borohydride (1.1 eq) was added in four portions. The solution was stirred at 0° C. for 30 min. An additional 0.1 eq sodium borohydride was added if necessary. The solvent was removed under vacuum and the resulting residue was purified by silica gel chromatography isocratic 1:1 methylene chloride:ethylacetate. The resulting white solid of 4-(5-chlorothiazolo[4,5-d]pyrimidin-7-yl)morpholine 16 was isolated.

1. customThe solvent was removed under vacuum
2. customthe resulting residue was purified by silica gel chromatography