Sodium Carbonate → tert-Butyl 6-(5-carbamoylpyridin-2-yl)-4-oxospiro[chroman-2,4'-piperidine]-1'-carboxylate

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반응 단계

1′-tert-butoxycarbonyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)spiro[chroman-2,4′-piperidin]-4-one (40.0 g, 90.0 mmol), 6-chloronicotinamide (17.0 g, 108 mmol), Pd(PPh3)4 (5.21 g, 4.51 mmol), and aqueous 2M Na2CO3 (100 ml) solution were suspended in dioxane (300 ml) and heated at 100° C. for 16 h. The reaction mixture was diluted with CHCl3 and H2O, the aqueous layer was extracted with CHCl3. The combined organic layer was washed with brine, dried over MgSO4 and silicagel. The desiccant was removed through celite filtration and the filtrate was concentrated under reduced pressure. The resulting residue was purified by crystallization (CHCl3-EtOAc) to obtain the intended compound as a colorless solid.

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