Methanol → HCID 178497119, compound

Participants

Reaction Conditions

Reaction Steps

A flask charged with a stir bar, trifluoromethanesulfonic acid cis-1-(1-trifluoromethane-sulfonyl-1H-benzoimidazole-5-carbonyl)-2,3,4,4a,9,9a-hexahydro-1H-indeno[2,1-b]pyridin-6-yl ester (mixture of isomers regarding sulfonyl group attachment to N-1 or N-3 of the benzimidazole, 0.50 g), triethylamine (0.18 mL), N,N-dimethylformamide (2 mL), and methanol (1 ml) is sparged with argon for 5 min. [1,1′-Bis(diphenylphosphino)ferrocene]-dichloropalladium dichloromethane complex (53 mg) is added and the mixture is sparged with carbon monoxide for another 5 min. The mixture is then heated to 70° C. under carbon monoxide atmosphere (4 bar) and shaken at this temperature overnight. After cooling to room temperature, the mixture is filtered and the filtrate is concentrated under reduced pressure. The residue is chromatographed on silica gel (dichloromethane/methanol 1:0→9:1) to afford the title compound. Yield: 0.27 g (87% of theory); LC (method 1): tR=2.43 min; Mass spectrum (ESI+): m/z=376 [M+H]+.

Provenance & Evidence