Triethylamine → Methyl 2-(2-((trimethylsilyl)ethynyl)phenyl)acetate

Participants

Reaction Steps

To a solution of ester 318 (7.50 g, 27.2 mmol) in dry DME (125 mL) at 0° C. was added triethylamine (6.0 mL, 4.3 g, 43 mmol), copper (I) iodide (1.00 g, 5.25 mmol), and bis(triphenylphosphine) palladium (II) chloride (0.65 g, 0.93 mmol). The mixture was degassed with a stream of N2 for 5 min, then trimethylsilylacetylene (5.8 mL, 4.1 g, 41 mmol) was added and the reaction mixture was warmed to room temperature and stirred for 24 h. It was concentrated under reduced pressure, partitioned between ethyl acetate and water, washed with brine, dried (anhydrous MgSO4), filtered and concentrated. Flash chromatography of the residue (eluent 4% ethyl acetate/hexanes) afforded title compound 319 (4.65 g, 69% yield). 1H NMR (400 MHz, CDCl3) δ (ppm): 7.22 (dd, J=7.4, 0.8 Hz, 1H); 7.07-6.95 (m, 3H); 3.58 (s, 2H); 3.45 (s, 3H); 0.00 (s, 9H). LCMS: (M+H) 247.1.

Provenance & Evidence