Methanol → (R)-2-Methyl-N-((R)-6-(trifluoromethyl)-2,3-dihydro-1H-inden-1-yl)propane-2-sulfinamide

Participants

Reaction Conditions

Reaction Steps

Sodium borohydride (756 mg, 20.0 mmol) was stirred in a round-bottomed flask under argon at −40 to −50° C. The reaction mixture of Intermediate 4A was added dropwise to the flask, and THF was added to the reaction mixture (ca. 0.6 M). The resulting mixture was allowed to warm up to 0° C. during 1.5 h period. The reaction mixture was cooled in dry ice and MeOH was added dropwise until gas evolution stopped. The mixture was stirred at rt for 20 min, filtered through Celite and rinsed with EtOAc then CH2Cl2. The filtrate was washed with brine (2×) and dried over MgSO4, filtered and concentrated. The residue was purified by flash chromatography (hexanes/EtOAc) to give Intermediate 4B (370 mg, 1.21 mmol, 26.7% yield) as colorless crystals. LC-MS (ESI) 306.0 (M+H), RT=2.10 min (Method B).

Provenance & Evidence