Trifluoroacetic acid → Isoquinolin-3-yl-carbamic acid 2-[3-(2-chloro-3-fluoro-benzyl)-1-methyl-ureido]-3-(2,3-dihydroxy-propoxy)-propyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of Isoquinolin-3-yl-carbamic acid 2-(tert-butoxycarbonyl-methyl-amino)-3-(2,2-dimethyl-[1,3]-dioxolan-4-ylmethoxy)-propyl ester (2.9 g, 5.93 mmol) in DCM (200 mL) was added TFA (12 mL) at 0° C. The mixture was stirred for 2 h, concentrated under reduced pressure, and re-dissolved in THF (10 mL) and DIEA (6.6 mL, 37.8 mmol). To this THF solution was added pre-stirred solution of 4-nitrophenylchloroformate (1.33 g, 6.62 mmol), 2-chloro-3-fluorobenzylamine (1.0 g, 6.3 mmol), and DIEA (1.2 mL, 6.9 mmol) in THF (85 mL) at 0° C. The reaction mixture was stirred for 2 h allowing the reaction to gradually warm to 24° C. The mixture was concentrated under reduced pressure, re-dissolved in MeOH, filtered, and purified by RP-HPLC using a mixture of acetonitrile and H2O to give isoquinolin-3-yl-carbamic acid 2-[3-(2-chloro-3-fluoro-benzyl)-1-methyl-ureido]-3-(2,3-dihydroxy-propoxy)-propyl ester (1.1 g, 45% over two steps). LRMS (M+H+) m/z 535.1.

Provenance & Evidence