Hydrochloric Acid → 7-Phenyl-isoquinoline-5-sulfonic acid (2-amino-ethyl)-amide hydrochloride

7-Phenyl-isoquinoline-5-sulfonic acid (2-amino-ethyl)-amide carbamic acid t-butyl ester (1.44 g, 3.37 mmol) is dissolved in CH3OH (20 mL) and CH2Cl2 (20 mL) and HCl (37%, 5.0 mL) is added. After the mixture is stirred overnight, the mixture is concentrated and dried under high vacuum to give 1.34 g (100% yield) 7-phenyl-isoquinoline-5-sulfonic acid (2-amino-ethyl)-amide hydrochloride. Load the product onto ion exchange resin and elute with 1N NH3 in methanol and concentrate to dryness to give the free base.