Sodium Hydroxide → 1-(2-Chloro-5-thiazolylmethyl)-3,3-dimethyl-l-methanesulphonyl-2-nitroguanidine

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Reaction Steps

To a solution of 1-(2-chloro-5-thiazolylmethyl)-3,3- dimethyl-2-nitroguanidine (0.300 g) in an aqueous NaOH solution (NaOH (0.319 g) and water (10 ml)) were added CH2Cl2 (10 ml) and 4-dimethylaminopyridine (0.013 g). To the mixture was added methanesulphonyl chloride (0.391 g) dropwise at room temperature under stirring. After stirring for 30 minutes, the mixture was partitioned. The organic layer was dried over MgSO, and concentrated in vacuo. The resulting residue was applied to column chromatography on silica gel. The column was eluted with hexane-AcOEt (1:1) to afford 0.160 g of 1-(2-chloro-5-thiazolylmethyl)-3,3-dimethyl-l-methanesulphonyl-2-nitroguanidine (Compound No. 28) as a pale yellow crystal, m.p. 82°-86° C.

Provenance & Evidence