Dimethylformamide → (S)-7-(4-fluoropyridin-3-yl)-3-((3-methyloxetan-3-yl)ethynyl)-5'H-spiro[chromeno[2,3-b]pyridine-5,4'-thiazol]-2'-amine

Participants

Reaction Steps

A vial was charged with (S)-3-bromo-7-(4-fluoropyridin-3-yl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-thiazol]-2′-amine (120 mg, 0.27 mmol), copper(I) iodide (20.62 mg, 0.11 mmol), and tetrakis(triphenylphosphine)palladium (31.3 mg, 0.027 mmol). The vial was flushed with Ar (g), then DMF (1 mL), and trimethyl((3-methyloxetan-3-yl)ethynyl)silane (137 mg, 0.81 mmol), DIPA (574 μL, 4.06 mmol) were added in sequence. The vial was flushed with Ar (g), sealed, and placed in a 90° C. oil bath. The mixture was stirred overnight. After cooling to rt, the crude was purified by silica gel chromatography (Redi-Sep pre-packed silica gel column (40 g), 0-80% EtOAc in 90:10 CH2Cl2:CH3OH to provide a white solid, (S)-7-(4-fluoropyridin-3-yl)-3-((3-methyloxetan-3-yl)ethynyl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-thiazol]-2′-amine (35 mg, 0.076 mmol, 28% yield).

Provenance & Evidence