1-Bromo-2-methylpropane → HCID 18975664, compound

Participants

Reaction Conditions

Reaction Steps

n-Butyllithium (2.83 ml, 1.8M in hexanes) was added dropwise to a solution of diisopropylamine (0.71 ml) in dry tetrahydrofuran (5 ml) at ambient temperature. After 15 minutes the solution was cooled to -23° C. and treated slowly with a solution of 1-cyclobutyl-7-methoxy-3,4-dihydroisoquinoline (1 g) in tetrahydrofuran (11 ml). The dark green solution was stirred for 30 minutes, further cooled to -78° C. and treated with 1-bromo-2-methylpropane (5.1 ml). After 1 hour at -78° C. the mixture was allowed to warm to ambient temperature, then heated under reflux for 1 hour. The mixture was poured onto water, acidified, and washed with ether. The aqueous phase was then basified by addition of aqueous sodium hydroxide solution and extracted with ethyl acetate. The solvent was removed in vacuo to yield an orange gum which was purified by flash chromatography over silica gel using a 1:4 mixture of ethyl acetate and light petroleum ether as eluant to give 7-methoxy-1-[1-(2-methylpropyl)cyclobutyl]-3,4-dihydroisoquinoline as an oil (0.85 g).

Provenance & Evidence