Ammonium Chloride → 4-[6-(4-Benzyloxy-2-fluoro-phenyl)-3-methyl-1-(tetrahydro-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridin-4-ylmethyl]-2,2-dimethyl-piperazine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

To a solution of 106 mg 2,2-dimethyl-piperazine-1-carboxylic acid tert-butyl ester in 5 ml of dichloromethane was added 200 mg of freshly prepared 6-(4-benzyloxy-2-fluoro-phenyl)-3-methyl-1-(tetrahydro-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridine-4-carbaldehyde. 143 mg of sodium triacetoxyborohydride and 15 mg of acetic acid were added and the reaction was stirred at r.t. for 16 h. The reaction was then diluted with dichloromethane and shaken with sat. aqueous ammonium chloride solution. The layers were separated and the organic layer was dried over sodium sulphate, filtered and concentrated in vacuo. 318 mg (100%) of the crude title compound were obtained which were used in the next step without further purification.

Provenance & Evidence