Cesium carbonate → (2R,3S)-1-tert-Butyloxycarbonyl-3-(tert-butyldimethylsilanyloxy)-2-[(1S)-1-(3-chloro-4-cyano-2-methyl-phenylamino)ethyl]pyrrolidine

Participants

Reaction Conditions

Reaction Steps

To a solution of 9D (325 mg, 0.94 mmol) in nitrogen degassed toluene:DMSO (2:1, 7 mL) at rt was added 9E (260 mg, 0.94 mmol), Cs2CO3 (614 mg, 1.89 mmol) and a solution of Pd2(dba)3 and (S)-N,N-dimethyl-1-[(R)-2-(diphenyphosphino)ferrocenyl] ethylamine (1:6 ratio, 0.06 mol%) in nitrogen degassed toluene (3 mL). The reaction was degassed with nitrogen for 30 minutes, sealed and heated at 110° C. for 48 h. Cool to rt and extract with ethylacetate (50 mL) and wash with water followed by sat. aqueous NaHCO3. Dry over MgSO4, filter and concentrate. Purification by flash chromatography (40 g ISCO silica gel cartridge, 0-10% ethylacetate in hexane gradient) gave the title compound (460 mg): MS (ES) m/z 494.29 [M+H]+

Provenance & Evidence