Dimethylformamide → 9-(2-Fluoro-ethyl)-2,3,4,9-tetrahydro-1H-carbazole-4-carbonyl chloride

Participants

Reaction Steps

9-(2-Fluoro-ethyl)-2,3,4,9-tetrahydro-1H-carbazole-4-carboxylic acid (31) (0.5 g, 1.91 mmol) in dry dichloromethane (6 mL) was stirred under an atmosphere of nitrogen at room temperature with oxalyl chloride (490 mg, 3.8 mmol, 0.34 mL) and a drop of DMF. The reaction was concentrated in vacuo to afford 545 mg (quantitative) of 9-(2-fluoro-ethyl)-2,3,4,9-tetrahydro-1H-carbazole-4-carbonyl chloride (32) which was used in the next step without purification. The structure was confirmed by 13C NMR (75 MHz, CDCl3) δC 20.2, 21.6, 26.7, 43.1, 43.4, 50.6, 80.9, 83.1, 105.3, 108.8, 118.3, 120.0, 121.6, 126.5, 136.2, 137.5, 176.1.

Provenance & Evidence