Oxonium, triethyl-, hexafluorophosphate(1-) (1:1) → (S)-methyl 5-(tert-butoxycarbonyl(methyl)amino)-6-(isoquinolin-3-ylcarbamoyloxy)hexanoate

Participants

Reaction Steps

To a solution of (S)-2-(tert-butoxycarbonyl(methyl)amino)-6-methoxy-6-oxohexyl 1H-imidazole-1-carboxylate (2 g, 5.4 mmol) in DCM (10 mL) was added a solution of triethyloxonium hexafluorophosphate (1.61 g, 6.5 mmol, 1.2 equiv.) in DCM (5 mL) dropwise at 0° C. The solution was warmed up to RT and stirred for 15 min. A solution of isoquinolin-3-amine (0.94 g, 6.5 mmol, 1.2 equiv.) in DCM (5 mL) was added. The solution was stirred for overnight. DCM was removed and the residue was purified on RP-HPLC using a mixture of acetonitrile and H2O to give (S)-methyl 5-(tert-butoxycarbonyl(methyl)amino)-6-(isoquinolin-3-ylcarbamoyloxy)hexanoate (1.4 g, 58%). LRMS (M+H+) m/z 446.2.

Provenance & Evidence