Diisopropylamine → HCID 18975670, compound

Participants

Reaction Conditions

Reaction Steps

n-Butyllithium (7.3 ml, 2.09M in hexanes) was added dropwise at ambient temperature to a solution of diisopropylamine (2.12 ml) in dry tetrahydrofuran (14 ml). After 15 minutes, the solution was cooled to -23° C. and a solution of 1-cyclobutyl-7-methoxy-3,4-dihydroisoquinoline (3 g) in tetrahydrofuran (34 ml) was added. After 30 minutes the mixture was cooled to -78° C., treated with 2-chloropyridine (1.56 ml), stirred for 1 hour then warmed to ambient temperature. The mixture was heated under reflux for 5 minutes, stirred for 16 hours at ambient temperature, then heated under reflux for 30 minutes. The reaction mixture was poured onto water and extracted with ethyl acetate. The extracts were dried and concentrated and the residual orange oil heated at 90° C. at 13.3 mbar to remove excess 2-chloropyridine. The residue was purified by flash chromatography over silica gel using a 5:1 mixture of light petroleum and triethylamine as eluant to give 7-methoxy-1-[1-(2-pyridyl)cyclobutyl]-3,4-dihydroisoquinoline as a solid (0.58 g).

Provenance & Evidence