Water → 3-Benzo[1,3]dioxol-5-yl-1-[(S)-1-(2,3-dihydrobenzo[1,4]dioxin-2-yl)methyl]-piperidine

Participants

Reaction Steps

(3-Benzo[1,3]dioxol-5-ylpiperidin-1-yl-(R)-2,3-dihydrobenzo[1,4]dioxin-2-ylmethanone (285 mg, 0.77 mmol) was dissolved in dry DMF (2.5 ml) and 1 M BH3 THF (3.10 ml, 3.10 mmol) was slowly added under a nitrogen atmosphere. The reaction mixture was stirred for 4.5 h at RT and then cooled to 0° C. Water was slowly added and the mixture basified with 2.5 M NaOH and extracted three times with EtOAc. The combined organic phases were dried (Na2SO4), filtered and evaporated to dryness. The crude product was dissolved in methanol (25 ml) and 5 M HCl (1.5 ml) was slowly added. The mixture was stirred for 1 h at RT and then at 60° C. for 2 h. The reaction mixture was evaporated to dryness, redissolved in EtOAc and washed twice with 1 M Na2CO3 and water. The combined organic phases were dried (Na2SO4), filtered and evaporated to dryness to give 228 mg of the title compound.

Provenance & Evidence