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

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To a solution of 61F (325 mg, 0.94 mmol) in degassed toluene:DMSO (2:1, 7 mL) at rt was added 61G (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 min, sealed and heated at 110° C. for 48 h. Cool to rt and extract with EtOAc (50 mL) and wash with water followed by sat'd aqueous NaHCO3. Dry over MgSO4, filter and concentrate. Purification by flash chromatography (40 g ISCO silica gel cartridge, 0-10% EtOAc in hexane gradient) gave the title compound (460 mg): MS (ES) m/z 494.29 [M+H]+

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