Hexane → 6-((S)-2-(((2S,5R)-3,6-diethoxy-5-isopropyl-2,5-dihydropyrazin-2-yl)methyl)-3-methylbutyl)-1-(3-methoxypropyl)-1H-indazole

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of (R)-3,6-diethoxy-2-isopropyl-2,5-dihydropyrazine (480 mg, 2.3 mmol) in anhydrous THF (7 mL) at −78° C. was added dropwise 2.5 M n-BuLi in hexane (0.9 mL, 2.3 mmol). After stirring for 2 h at −78° C., a solution of (R)-6-(2-(bromomethyl)-3-methylbutyl)-1-(3-methoxypropyl)-1H-indazole (530 mg, 1.5 mmol) in THF (2 mL) was added dropwise. The mixture was stirred for 1 h at −78° C., then warmed to rt and stirred for 12 h. The reaction mixture was quenched with satd aq NH4Cl and extracted with EtOAc (3×10 mL). The combined organic layers were washed with brine, dried over Na2SO4, evaporated, and purified by flash chromatography on silica gel to give 6-((S)-2-(((2S,5R)-3,6-diethoxy-5-isopropyl-2,5-dihydropyrazin-2-yl)methyl)-3-methylbutyl)-1-(3-methoxypropyl)-1H-indazole (493 mg, 68%). MS: 485 (M++1).

Provenance & Evidence