1-Butanol → Ethyl 6-bromo-4-butoxy-2-cyclopropylmethyl-1-oxo-1,2-dihydro-3-isoquinolinecarboxylate

Participants

Reaction Steps

To a solution of ethyl 6-bromo-2-cyclopropylmethyl-4-hydroxy-1-oxo-1,2-dihydro-3-isoquinolinecarboxylate (7.32 g, 20 mmol), 1-butanol (2.7 mL, 30 mmol) and tributylphosphine (10.0 mL, 40 mmol) in tetrahydrofuran (100 mL) was added 1,1′-(azodicarbonyl)dipiperidine (10.09 g, 40 mmol) and the mixture was stirred at room temperature for 3 h. The reaction mixture was concentrated under reduced pressure and the residue was purified, by silica gel column chromatography to give ethyl 6-bromo-4-butoxy-2-cyclopropylmethyl-1-oxo-1,2-dihydro-3-isoquinolinecarboxylate (7.24 g, 85.8%) as an oil.

Provenance & Evidence