Ethyl 6-chloronicotinate → Ethyl-6-[(2,2,4,4,7-pentamethyl-6-chromanyl)-ethynyl]nicotinate

Participants

Reaction Conditions

Reaction Steps

A solution of 300 mg (1.316 mmol) of 2,2,4,4,7-pentamethyl-6-ethynyl-chroman (compound 4s) and 245.6 mg (1.3276 mmol) of ethyl 6-chloro-nicotinate (Compound 29) in 2 ml of triethylamine was placed in a pressure tube and a stream of nitrogen was bubbled through the solution for 15 min. The tube was then flushed with argon and a finely ground mixture of 100 mg (0.1425 mmol) of bis (triphenylphosphine) palladium (II) chloride and 50 mg (0.2625 mmol) of cuprous iodide was added to the solution. The pressure tube was then sealed and the reaction mixture heated at 60 degrees C. for 72 h. The mixture was cooled to room temperature and the triethylamine removed under vacuum. The residue was purified by flash chromatography (silica; 10% ethyl acetate in hexane) to give the title compound as a yellow solid. PMR (CDCl3): & 1.37 (6H, s), 1.38 (6H, s), 1.44 (3H, t, J~7.2 Hz), 1.85 (2H, s), 2.49 (3H, s), 4.43 (2H, q, J~7.2 Hz), 6.70 (1H, s), 7.55-7.61 (2H, m), 8.28 (1H, dd, J~8.2 Hz, 2.1 Hz), 9.22 (1H, d, J~2 1 Hz). MS exact mass, m/e 377.1982 (calcd. for C24H27O3N, 377.1991).

Provenance & Evidence