Dimethylformamide → 7-bromo-8-fluoro-3-((3-methyloxetan-3-yl)ethynyl)-5'H-spiro[chromeno[2,3-b]pyridine-5,4'-oxazol]-2'-amine

Participants

Reaction Steps

A vial charged with Pd(PPh3)4 (0.73 g, 0.63 mmol), copper(I) iodide (0.48 g, 2.52 mmol), 7-bromo-8-fluoro-3-iodo-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-oxazol]-2′-amine (3.0 g, 6.30 mmol), trimethyl((3-methyloxetan-3-yl)ethynyl)silane (1.06 g, 6.30 mmol) and 13 mL DMF was degassed with argon and treated with DIPA (4.49 mL, 31.5 mmol). The resulting slurry was allowed to stir at RT for 18 h at which point an additional portion of copper(I) iodide (0.48 g, 2.52 mmol) was added. After stirring for an additional 4 h the reaction mixture was poured into water (50 mL) and was extracted with EtOAc (3×100 mL). The resulting suspension was filtered through a glass frit and the filtrate was dried over MgSO4 and concentrated in vacuo. Purification of the crude residue by column chromatography [0-50% (9:1 CH2Cl2:MeOH)/CH2Cl2] provided 7-bromo-8-fluoro-3-((3-methyloxetan-3-yl)ethynyl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-oxazol]-2′-amine (1.18 g, 2.66 mmol).

Provenance & Evidence