Benzonitrile, 4-((3aR,4S,6R,6aS,8aS,8bR)-octahydro-4-hydroxy-6-methyl-7-oxo-3a,6-epoxy-3ah-pyrano(2,3,4-cd)isoindol-8(4H)-yl)-2-(trifluoromethyl)- → 4-((1R,2R,4R,5S,8S,12R)-2-hydroxy-2,4-dimethyl-6-oxo-9,13-dioxa-7-azatetracyclo[6.3.1.11,4.05,12]tridec-7-yl)-2-(trifluoromethyl)benzonitrile

Participants

Reaction Steps

Methylmagnesium bromide (3M in ether, 0.476 mL, 1.427 mmol) was added drop wise to a solution of Example 3 (280 mg, 0.714 mmol) in THF (10 mL) at −30° C. The resulting reaction mixture was stirred for 1 h. The reaction mixture was quenched with saturated ammonium chloride (10 mL) and extracted with EtOAc (2×20 mL). The combined organic layers were dried over magnesium sulfate, concentrated in vacuo and purified by flash chromatography on silica gel using an automated ISCO system (40 g column, eluting with 10-100% EtOAc/hexane, Flow rate: 40 mL/min) to give Example 37 (64 mg, 22% yield) as a white solid along with 204 mg of recovered starting material.

Provenance & Evidence