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

関与物質

反応条件

反応手順

A vial was charged with (5)-tert-butyl 3-bromo-7-(2-fluoropyridin-3-yl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-thiazole]-2′-ylcarbamate (0.181 g, 0.333 mmol), copper(i) iodide (0.013 g, 0.067 mmol), and bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (0.024 g, 0.033 mmol). The vial was flushed with Ar (g), then DMF (1.665 mL), DIPA (0.712 mL, 5.00 mmol), and trimethyl((3-methyloxetan-3-yl)ethynyl)silane (0.201 mL, 0.999 mmol) were added in sequence. The reaction was heated to 90° C. and stirred for three hours. The reaction was diluted with EtOAc and washed with water. The aqueous layer was extracted with EtOAc, and the combined organic layers were dried with sodium sulfate, filtered, and concentrated. The material was purified via silica gel chromatography (gradient elution 0-50% EtOAc:Hex) to afford (S)-tert-butyl 7-(2-fluoropyridin-3-yl)-3-((3-methyloxetan-3-yl)ethynyl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-thiazole]-2′-ylcarbamate as a yellow solid. MS m/z=559.2. Calc'd for C30H27FN4O4S: 558.62.

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