CID 406 → 3-(5-Methoxy-1H-indol-3-yl)-acrylic acid methyl ester

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To a cold solution (ice bath) of methyl phosphonoacetate (13.74 g, 0.065 mol) in tetrahydrofuran (120 mL) under nitrogen, was added sodium hydride (2.6 g, 0.065 mol, 60%) in one portion, and stirred until hydrogen evolution ceased. A solution of commercially available 5-Methoxyindole-3-carboxyaldehyde 2 (5.2 g, 0.029 mol) in tetrahydrofuran (80 mL) was added, over a period of 60 minutes, to the phosphonate solution. The reaction mixture was heated to 55° C. for 24 h after which the mixture was diluted with dichloromethane (DCM, 500 mL) and washed with water (200 mL; 3×). The organic layer was washed once with brine, dried over anhydrous sodium sulfate, and evaporated under reduced pressure to give yellow-tinted oil and purified by filtering through a silica plug. The filtrate was evaporated to afford 3 as an off white solid (6.2 g; 78% yield; M+1=232.0).

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