Cesium carbonate → HCID 59756823, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 2.2 g (8.7 mmol) 1-(6-chloro-1H-indol-3-yl)-2,2,2-trifluoro-ethanone, 3.7 g (13 mmol) (S)-2-methanesulfonyloxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (preparation described in Tetrahedron 2006, 62, 4584-4589) and 5.7 g (18 mmol) cesium carbonate in 44 ml dry 1,3-dimethyl-3,4,5,6-tetrahydropyrimidinone (DMPU) was stirred for 48 h at 80° C. The reaction mixture was diluted with 100 ml water and extracted with ethyl acetate (3×100 ml). The combined organic layers were dried over sodium sulfate and concentrated to dryness. Residual DMPU was removed by kugelrohrdistillation in high vacuo (ca. 1 mbar) at 120° C. Flash chromatography gave the title compound (1.7 g, 46%) as a light yellow solid.

Provenance & Evidence