Water → 1,1-Dimethylethyl 4-(1,2,3,4-tetrahydro-5-isoquinolinyl)-1-piperazinecarboxylate

Participants

Reaction Steps

4-Isoquinoline-5-yl-piperazine-1-carboxylic acid tert-butyl ester (1.5 g) from Step 2 was dissolved in 5 mL of tetrahydrofuran (THF), and excess borane (BH3) in THF was added thereto. The mixture was brought to reflux for 1 hour, and allowed to cool to room temperature. The mixture was then further cooled in an ice bath, and water was carefully added to the reaction mix to consume excess borane. The reaction mix was then diluted with EtOAc, washed with saturated aqueous sodium bicarbonate (NaHCO3), dried over MgSO4, and chromatographed to provide 4-(1,2,3,4-tetrahydroisoquinolin-5-yl)-piperazine-1-carboxylic acid tert-butyl ester as a viscous oil (0.668 g).

Provenance & Evidence