Potassium Carbonate → 1-methyl-4-(5-nitro-2-(4-(oxetan-3-yl)piperazin-1-yl)phenyl)-1,4-dihydro-5H-tetrazol-5-one

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Reaction Steps

A mixture of 1-(2-fluoro-5-nitrophenyl)-4-methyl-1,4-dihydro-5H-tetrazol-5-one (1.1 g, 1.0 eq, 4.5 mmol) (see, e.g., WO 2011/068898), 1-(oxetan-3-yl)piperazine (0.64 g, 1.0 eq, 4.5 mmol) was dissolved in annhydrous DMF (100 mL) and stirred at room temperature. K2CO3 (1.9 g, 3.0 eq, 13.5 mmol) was added to the above solution and the heterogeneous mixture was stirred at room temperature overnight. The reaction mixture was diluted with EtOAc (50 mL) and partitioned with H2O (50 mL). The layers were separated and the aqueous layer was washed with EtOAc (50 mL). The combined organic layers were dried over Na2SO4 and concentrated under reduced pressure to leave a crude solid. Purification of the crude solid by column chromatography on silica gel (ISCO System) using 20% MeOH in CH2Cl2/CH2Cl2 (gradient system from 1:9 to 1:1) as eluent gave the product in 50% yield.

Provenance & Evidence