Dimethylformamide → (+)-(4aR)-(10bR)-4-methyl-8-(5-nitro-2-quinolinylthio)-10b-methyl-1,2,3,4,4a,5,6,10b-octahydrobenzo[f]quinolin-3-one

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A 15 mL round bottom flask was charged with (+)-(4aR)-(10bR)-4-methyl-8-mercapto-10b-methyl-1,2,3,4,4a,5,6,10b-octahydrobenzo[f]quinolin-3-one (31 mg, 0.12 mmol), potassium carbonate (158 mg, 1.14 mmol), 2-chloro-5-nitroquinoline (30 mg, 0.14 mmol) and 1 mL of anhydrous dimethylformamide, fitted with a reflux condenser, and the stirred mixture was heated at 60°, under nitrogen, for 18 h. The mixture was cooled, diluted with ethyl acetate (75 mL) and washed with brine (2×25 mL). The combined organic extracts were dried over sodium sulfate, concentrated, and purified by silica gel chromatography (ethyl acetate eluent) to give 29 mg (56%) of the title compound as an amorphous foam. mp 149°-154°. FDMS: m/e=433. α[D]589 =+60.00 (c=0.10, chloroform).

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