Acetic Acid → 4-(1-Acetylazetidin-3-yl)-7-chloro-6-fluoro-9-(1-hydroxyethyl)-2-methyl-4,5-dihydro-1,4-benzoxazepin-3(2H)-one

Participants

Reaction Conditions

Reaction Steps

A solution of 9-acetyl-4-(1-acetylazetidin-3-yl)-7-chloro-6-fluoro-2-methyl-4,5-dihydro-1,4-benzoxazepin-3(2H)-one (112 mg, 0.304 mmol) in methanol (5.6 mL) at −10° C. was treated with sodium tetrahydroborate (17 mg, 0.456 mmol) and stirred for 30 min at 0° C. The reaction mixture was quenched with acetic acid (86 μL, 1.52 mmol) at 0° C. and then diluted with ethyl acetate and water. The organic layer was separated, washed with brine, dried over sodium sulfate, filtered, and concentrated to give a crude residue. Purification via preparative LCMS (XBridge C18 column, eluting with a gradient of acetonitrile/water containing 0.1% ammonium hydroxide, at flow rate of 60 mL/min) gave two fractions. Each fraction contained a pair of enantiomers: peak 1 (30 mg, 27%) and peak 2 (50 mg, 44%). Peak 1: LCMS calculated for C17H21ClFN2O4 (M+H)+: m/z=371.1; found: 371.1. Peak 2: LCMS calculated for C17H21ClFN2O4 (M+H)+: m/z=371.1; found: 371.1.

Provenance & Evidence