Triethylamine → 2-[3-(5-Fluoro-1H-indol-3-ylmethyl)-piperidin-1-ylmethyl]-8-methyl-2,3-dihydro-(1,4]dioxino[2,3-f]quinoline

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Reaction Steps

A solution of (2R)-4-bromobenzenesulfonic acid 8-methyl-2,3-dihydro-[1,4]dioxino[2,3-f]quinolin-2-ylmethyl ester (0.090 g, 0.24 mmol), 5-fluoro-3-piperidin-3-ylmethyl-1H-indole (0.56 g, 0.24 mmol) and triethylamine (0.042 mL, 0.36 mmol) in dimethylsulfoxide (10 mL) was heated at 90° C. under nitrogen overnight. The reaction mixture was quenched with 1N sodium hydroxide and extracted with methylene chloride (3×50 mL). The organic layer was washed with water (3×50 mL), dried over anhydrous sodium sulfate, filtered, and concentrated in vacuum. The crude oil was column chromatographed on silica gel (5% methanol-75% ethyl acetate-20% hexane). The product-containing fractions were concentrated in vacuum to give 0.048 g (53%) of the (S)-enantiomer of the title compound as a brown oil. The dihydrochloride salt was prepared in ethyl acetate and collected as 0.037 g of a yellow solid, m.p. 68° C. (dec).

Provenance & Evidence