Triethylamine → 1-Chloro-isoquinoline-5-sulfonic acid {2-[2-(2-trifluoromethyl-phenoxy)-ethylamino]-ethyl}-amide

Participants

Reaction Conditions

Reaction Steps

A 4.2 mL of the (2-trifluoromethyl-phenoxy)-acetaldehyde stock solution (˜0.69 mmol) is added to a stirred mixture of 1-chloro-isoquinoline-5-sulfonic acid (2-amino-ethyl)-amide hydrochloride (200 mg, 0.621 mmol), 4 Å molecular sieve (400 mg) and NEt3 (0.19 mL, 1.4 mmol) in anhydrous CH3OH (5 mL) at ambient temperature under nitrogen. The resultant mixture is stirred for 16 hours. The mixture is cooled to 0° C. before it is treated with powdered sodium borohydride (53 mg, 1.4 mmol). The mixture is stirred at 0° C. for 1 hour and at ambient temperature for another 1 hour. After filtration and subsequent concentration in vacuo, the crude product is chromatographed on silica (gradient 0-5% CH3OH in CH2Cl2) to give 92 mg (0.19 mmol, 31% yield) of 1-chloro-isoquinoline -5-sulfonic acid {2-[2-(2-trifluoromethyl-phenoxy)-ethylamino]-ethyl}-amide. ESIMS: m/z 474 [(M+H)+, 35Cl], 476 [(M+H)+, 37Cl].

Provenance & Evidence