tert-butyl 8,8-dimethyl-6-oxo-3,4,7,8-tetrahydro-1H-[1,4]diazepino[6,7,1-ij]quinoline-2(6H)-carboxylate → tert-butyl 8,8-dimethyl-3,4,7,8-tetrahydro-1H-[1,4]diazepino[6,7,1-ij]quinoline-2(6H)-carboxylate

Participants

Reaction Steps

A solution of 38 mg (0.115 mmol) tert-butyl 8,8-dimethyl-6-oxo-3,4,7,8-tetrahydro-1H-[1,4]diazepino[6,7,1-ij]quinoline-2(6H)-carboxylate of step 1.2 in 1 mL of tetrahydrofuran was treated with 0.46 mL of 1 molar solution of borohydride-tetrahydrofuran complex in tetrahydrofuran. The mixture was stirred over night, and then quenched with water and diluted hydrochloric acid. The pH was adjusted to pH 9 by addition of aqueous sodium hydroxide solution and the mixture extracted three times with 10 mL of dichloromethane each. The solution was dried over magnesium sulfate and concentrated in vacuo. The residue was purified by column chromatography on silica (eluent: 20-30% ethyl acetate in heptane) to yield 21 mg of the title compound as a clear oil.

Provenance & Evidence