反应详情

Triphenylphosphine (0.694 g, 2.65 mmol), tetrahydrofuran (2.12 mL), 2-morpholinoethanol (0.321 mL, 2.65 mmol) and diethylazodicarboxylate (0.418 mL, 2.65 mmol) were added to 3-{1-perhydro-2H-pyran-2-yl-5-[1-(triphenylmethyl)(1,2,4-triazol-3-yl)]-1H-indazol-3-yl}phenol (0.400 g, 0.662 mmol). The mixture was stirred at ambient temperature for 23 h and poured into aqueous 6 N hydrochloric acid (30 mL). After stirring at ambient temperature for 4 h, the mixture was extracted with ether (3×). The aqueous fraction was added to aqueous 6 N sodium hydroxide (30 mL) and the pH adjusted to 11. The solution was extracted with ethyl acetate (3×) and the organic fractions were combined and dried over anhydrous sodium sulfate, filtered and evaporated. The residue was purified by flash chromatography on silica gel pretreated with 2% triethylamine/hexanes followed by 0–20% ethyl acetate/hexanes and gave the title compound (0.0774 g, 30% yield). 1H NMR (CD3OD) δ 8.72 (m, 1H), 8.36 (br s, 1H), 8.10. (dd, 1H), 7.68 (d, 1H), 7.62 (dt, 1H), 7.56 (t, 1H), 7.46 (t, 1H), 7.04 (m, 1H), 4.28 (t, 2H), 3.72 (t, 4H), 2.89 (t, 2H), 2.65 (t, 4H). ES-MS (m/z) 391 [M+1]+.

1. stirringAfter stirring at ambient temperature for 4 h
2. extractionthe mixture was extracted with ether (3×)
3. additionThe aqueous fraction was added to aqueous 6 N sodium hydroxide (30 mL)
4. extractionThe solution was extracted with ethyl acetate (3×)
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. customevaporated
8. customThe residue was purified by flash chromatography on silica gel