Cesium carbonate → Benzyl 2-(4-(1-(tert-butyldimethylsilyloxy)cyclopropyl)-3-fluorophenyl)acrylate

Participants

Reaction Conditions

Reaction Steps

To a stirred and degassed (degassed with Argon) suspension of tert-butyl(1-(2-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)cyclopropoxy)-dimethylsilane (10.23 g, 26.09 mmol, leg), Cs2CO3 (30.69 g, 78.27 mmol, 3 eq), and benzyl 2-bromoacrylate (9.59 g, 39.14 mmol, 1.5 eq) in DMF (100 mL) was added Pd(dppf)Cl2 (1.06 g, 1.305 mmol, 0.05 eq) and the mixture heated to 90-100° C. for 1 h. The reaction mixture was filtered through celite pad, diluted with water (100 mL) and extracted with ethyl acetate (250 mL). The ethyl acetate layer was washed with water (150 mL), brine (200 mL), dried (Na2SO4) and the solvent evaporated to get crude benzyl 2-(4-(1-(tert-butyldimethylsilyloxy)-cyclopropyl)-3-fluorophenyl)acrylate (4.14 g) as a yellow oil which was used for the next stage without purification (TLC system: EtOAc/PE (1:49), Rf: 0.5).

Provenance & Evidence