Dimethylformamide → HCID 86722069, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 4 (470 mg, 1.17 mmol, 1 eq), CuI (23 mg, 0.117 mmol, 0.1 eq.), Pd(PPh3)4 (68 mg, 0.058 mmol, 0.05 eq.) and DMF (8 mL) was degassed. Trimethsilyacetylene (173 mg, 1.760 mmol, 1.5 eq.) was added under Argon, followed by Et3N (356 mg, 4.81 mL, 3.52 mmol, 3 eq.). The mixture was heated at 70° C. for 24 h. After being cooled to room temperature, the reaction mixture was diluted with EtOAc (50 mL) and washed with brine (20 mL×2). The EtOAc solution was dried over MgSO4, filtered and concentrated. The crude product was purified by flash chromatography (0-30%, EtOAc in heptane) to afford the desired trimethsilyacetylene derivative (500 mg, 92%). The product was dissolved in MeOH (20 mL), and K2CO3 (138 mg, 1 mmol) was added. The reaction mixture was stirred at room temperature for 30 min before concentration. The residue was partitioned between EtOAc (20 mL) and H2O (20 mL). The EtOAc layer was washed with brine (10 mL), dried over MgSO4, filtered and concentrated. The crude product was purified by flash chromatography (0-50%, EtOAc in heptane) to afford 5 as colorless oil (423 mg, 100%).

Provenance & Evidence