反应详情

To a suspension of N-(5-cyano-4-(2,8-diazaspiro[4.5]decan-8-yl)pyridin-2-yl)-7-formyl-6-(hydroxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxamide (intermediate 44, 22 mg, 0.046 mmol) in DCM (0.5 ml) was added formaldehyde (37% in H2O, 0.035 ml, 0.463 mmol) and AcOH (2.65 μl, 0.046 mmol). The reaction mixture was stirred at room temperature for 15 min, then sodium triacetoxyborohydride (14.7 mg, 0.069 mmol) was added and the reaction mixture was stirred for 30 min. The reaction mixture was poured into sat. aq. NaHCO3 and extracted with DCM (2×). The organic phase was then dried over Na2SO4, filtered and evaporated. The crude material was purified by normal phase chromatography (4 g silica gel cartridge, DCM/(DCM/MeOH 9/1+1% Et3N) 100:0 to 0:100) to give the title compound as a colorless powder.

1. stirringthe reaction mixture was stirred for 30 min
2. extractionextracted with DCM (2×)
3. dry with materialThe organic phase was then dried over Na2SO4
4. filtrationfiltered
5. customevaporated
6. customThe crude material was purified by normal phase chromatography (4 g silica gel cartridge, DCM/(DCM/MeOH 9/1+1% Et3N) 100:0 to 0:100)