Lithium tri-s-butylborohydride → HCID 59278476, compound

Participants

Reaction Steps

To a chilled (−78° C.) solution of 2-methyl-propane-2-sulfinic acid [(S)-1-(4-bromopyridin-2-yl)-propyl]-amide (985 mg, 3.10 mmol) in THF (25 mL) is added a 1 M solution of L-Selectride (3.2 mL, 3.2 mmol) in THF. The reaction is monitored by TLC (EtOAc-ether 3:7) indicating a single diastereomer when compared to a mixture of diastereomers prepared by reduction of 2-methyl-propane-2-sulfinic acid [(S)-1-(4-bromopyridin-2-yl)-propyl]-amide with lithium borohydride in THF. After 3 hours, the mixture is quenched with saturated aqueous ammonium chloride (30 mL) and extracted with EtOAc (3×25 mL). The combined organic layers are washed with brine (3×30 mL), dried over magnesium sulfate, filtered and concentrated. The crude material is purified by silica gel chromatography eluting with a gradient of 0-100% EtOAc in dichloromethane. The material from the column is crystallized from hexanes to afford (S)-1-(4-bromopyridin-2-yl)-propylamine.

Provenance & Evidence