Sodium t-butoxide → HCID 86684923, compound

Participants

Reaction Steps

3-[4-(2-Methyl-pyridin-4-yl)-2-trifluoromethyl-phenylsulfanyl]-propionamide (15.0 g, 44.1 mmol) was dissolved in tetrahydrofuran (75 mL), before sodium tert-butoxide (4.15 g, 43.2 mmol) was added and the fine suspension was stirred for 2 h at room temperature. N,N-dimethylacetamide (37 mL) was added and the solution was stirred for further 2 h. A solution of benzenesulfonic acid (3S,5S)-5-(1-cyano-cyclopropylcarbamoyl)-1-(1-methyl-cyclo-propanecarbonyl)-pyrrolidin-3-yl ester (15.7 g, 37.7 mmol) in N,N-dimethylacetamide (37 mL) was added and the brown, clear solution was stirred for 65 h at room temperature. After that, the mixture was diluted with cold water (240 mL) and extracted with tert-butyl methyl ether (1×180 mL, 5×90 mL). The combined organic extracts were washed with aqueous sodium carbonate solution (1 M, 90 mL) and brine (90 mL), dried over sodium sulfate and concentrated in vacuo to yield the title compound as a brown gum (22.05 g). The crude product (containing dimethylacetamide) was used in the next step without further purification. MS (EI): m/z=529.1 [M+H]+. 1H NMR (CDCl3, 400 MHz): δ 0.56-0.66 (m, 2H), 0.87-0.93 (m, 1H), 1.04-1.09 (m, 1H), 1.18-1.22 (m, 2H), 1.31 (s, 3H), 1.45-1.57 (m, 2H), 1.95-2.04 (m, 1H), 2.65 (s, 3H), 2.95-3.01 (m, 1H), 3.91 & 4.02 (ABX, JAB=11.3 Hz, JAX=5.6 Hz, JBX=6.5 Hz, each 1H), 4.14-4.22 (m, 1H), 4.66 (dd, J=4.3 Hz, 8.1 Hz, 1H), 7.31 (dd, J=1.5 Hz, 5.3 Hz, 1H), 7.37 (bs, 1H), 7.69 & 7.80 (ABX, JAB=8.2 Hz, JAX=0 Hz, JBX=2.0 Hz, each 1H), 7.93 (d, J=1.9 Hz, 1H), 8.06 (bs, 1H), 8.60 (d, J=5.1 Hz, 1H).

Provenance & Evidence