Water → 6-(Piperidin-4-yloxy)-isoquinoline-5-carboxylic acid ethyl ester

Participants

Reaction Steps

A solution of 200 mg (0.44 mmol) 4-(5-iodo-isoquinoline-6-yloxy)-piperidin-1-carboxylic acid tert-butyl ester (12), 107 mg (0.88 mmol) of DMAP, 4.7 mg (0.1 eq) of Pd on charcoal (10%), 150 μL (0.88 mmol) of triethyl amine and 58 mg (0.22 mmol) of Mo(CO)6 in 3 mL of ethanol was heated to 135° C. for 1 h in a microwave reactor (CEM Discovery). Then water and ethyl acetate were added and the mixture was filtered through a Celite cartridge. After removal of the solvents the remainder was subjected to preparative HPLC to give the 7.4 mg Boc-protected intermediate. To remove the Boc group the intermediate was treated with 2 mL 5-6 N HCl in isopropanol at room temperature for 2 h. Purification by preparative HPLC gave 2.5 mg of compound 30 as TFA salt.

Provenance & Evidence