反応 #2329008

反応方程式

2-(6-aminopyridin-3-yl)-1,3-benzoxazol-6-ol

tert-butylchlorodimethylsilane

imidazole

tert-butylchlorodimethylsilane

imidazole

→

yellow solid

5-(6-{[tert-butyl(dimethyl)silyl]oxy}-1,3-benzoxazol-2-yl)pyridin-2-amine

溶媒

DMF

反応条件

後処理

1. 1
   workup.STIRRINGstirred at room temperature overnight
2. 2
   その他The reaction mixture was then partitioned between EtOAc (100 mL) and water (250 mL)
3. 3
   抽出the aqueous layer was extracted twice with EtOAc (100 mL)
4. 4
   洗浄The combined organic layers were washed with brine (100 mL)
5. 5
   乾燥dried (Na2SO4)
6. 6
   ろ過filtered
7. 7
   その他evaporated

実験手順

To a solution of 2-(6-aminopyridin-3-yl)-1,3-benzoxazol-6-ol (0.95 mmol) in DMF (25 mL) was added tert-butylchlorodimethylsilane (1.05 mmol) and imidazole (2.38 mmol), the resulting mixture was stirred at room temperature for 3 hours. LCMS showed no conversion. Additional tert-butylchlorodimethylsilane (1.05 mmol) and imidazole (2.38 mmol) was added to the reaction mixture, then stirred at room temperature overnight. The reaction mixture was then partitioned between EtOAc (100 mL) and water (250 mL), and the aqueous layer was extracted twice with EtOAc (100 mL). The combined organic layers were washed with brine (100 mL), dried (Na2SO4), filtered and evaporated to give 1.121 g of a yellow solid. Purified by flash column chromatography (SiO2, Heptane:EtOAc 0→100%), to give the title compound (322.5 mg) as an ivory-white solid. 1H NMR δ ppm 8.67 (d, 1H) 8.01 (dd, 1H) 7.54 (d, 1H) 7.18 (d, 1H) 6.85 (dd, 1H) 6.77 (s, 2H) 6.57 (d, 1H) 0.97 (s, 9H) 0.22 (s, 6H); MS m/z 342 (M+H).

出典