Diisopropylethylamine → (3R)-6-(1-hydroxy-2-(4-((S)-2-hydroxy-2-(4-methyl-1-oxo-1,3-dihydroisobenzofuran-5-yl)ethyl)piperazin-1-yl)ethyl)-3-methylisochroman-1-one

Participants

Reaction Conditions

Reaction Steps

To a solution of (R)-5-(1-hydroxy-2-(piperazin-1-yl)ethyl)-4-methylisobenzofuran-1(3H)-one (INTERMEDIATE 12) (150 mg, 0.54 mmol) in ethanol (2 mL) was added (3R)-3-Methyl-6-(oxiran-2-yl)-3,4-dihydro-1H-isochromen-1-one (INTERMEDIATE 23) (110 mg, 0.54 mmol) and Hunig's base (95 uL, 0.54 mmol). The mixture was heated to 80° C. for 20 hours. The solvent was removed using rotary evaporation and the crude oil was purified via by silica gel chromatography (0-7% MeOH in DCM) to yield (3R)-6-(1-hydroxy-2-(4-((S)-2-hydroxy-2-(4-methyl-1-oxo-1,3-dihydroisobenzofuran-5-yl)ethyl)piperazin-1-yl)ethyl)-3-methylisochroman-1-one as a diastereomeric mixture.

Provenance & Evidence