Lithium Hydroxide → 7-Carboxy-6,7-dihydro-1-methylpyrazolo[3,4-d]thiazolo[3,2-a]pyrimidin-4(1H)-one

Beteiligte Stoffe

Reaktionsschritte

In a mixture of 50 ml of dioxane and 14 ml of water was dissolved 1.30 g (6.24 mmol) of Compound 42 prepared in Example 33, and 0.52 g (12.5 mmol) of lithium hydroxide was added to the solution, followed by stirring at room temperature for 30 minutes. After evaporation of the solvent, the residue was dissolved in water, and then hydrochloric acid was added. The precipitated crystals were collected by filtration, and washed with water, followed by recrystallization from dimethylformamide/water to give 1.09 g (69%) of Compound 43.

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