1-benzyl-3,3-dimethylpiperazine

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 3.30 g 4-Benzyl-2,2-dimethyl-piperazine-1-carboxylic acid tert-butyl ester were dissolved in 50 ml methanol, and 25 ml of 1N aqueous hydrochloric acid were added. After stirring overnight 5 ml of concentrated aqueous hydrochloric acid were added. After 2 h the volatiles were removed in vacuo and 2.40 g (97%) of the title compound were obtained as hydrochloride salt, which could be use without further purification. were added After 2 h the volatiles were removed in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 3.30 g of 4-benzyl-2,2-dimethyl-piperazine-1-carboxylic acid tert-butyl ester were dissolved in 50 ml methanol, and 25 ml of 1N aqueous hydrochloric acid were added. After stirring overnight 5 ml of concentrated aqueous hydrochloric acid were added. After 2 h the volatiles were removed in vacuo and 2.40 g (97%) of the title compound were obtained as hydrochloride salt, which could be use without further purification. were added After 2 h the volatiles were removed in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In analogy to Example 1 step (d) 300 mg 6-(4-benzyloxy-2-fluoro-phenyl)-3-methyl-1-(tetrahydro-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid was reacted with 160 mg 1-benzyl-3,3-dimethyl-piperazine to obtain 410 mg (94%) of the title compound.