Ethyl bromoacetate → Ethyl [7-(4-t-butoxycarbonylpiperazin-1-yl)-3,4-dihydro-1(1H)-isoquinolinone-2-yl]acetate

Participants

Reaction Conditions

Reaction Steps

A solution of 7-(4-t-butoxycarbonylpiperazin-1-yl)-3,4-dihydro-1(1H)-isoquinolinone (1-3) (2.37 g, 7.16 mmol) in THF (30 mL) at -78° C. under argon was treated with NaHMDS (1M solution in THF; 7.88 mL, 7.88 mmol) and the temperature was allowed to rise to -50° C. over 30 minutes. The solution was cooled back to -78° C. and ethyl bromoacetate (1.19 mL, 10.7 mmol) was added in one lot. After stirring at ambient temperature for 3 hours, the mixture was poured into EtOAc, extracted with 1N HCl, washed with brine (twice), dried (MgSO4) and evaporated to give an oil. Column chromatography (hexane/EtOAc 1:1 then 1:2) gave 1-4 as a solid. Rf (silica; hexane/EtOAc 1:1)=0.38.

Provenance & Evidence