反应详情

温度

80 °C

To (1S,4S,5R)-5-ethyl-2-oxabicyclo[2.2.1]heptan-3-one (0.835 g, 5.96 mmol) in 1,4-dioxane (12 mL) was added 2-hydrazinyl-5-tosyl-5H-pyrrolo[2,3-b]pyrazine (step D, 1.810 g, 5.96 mmol). The reaction mixture was heated at about 80° C. for about 16 h then cooled to ambient temperature. 1,4-Dioxane (25 mL) and trimethylaluminum (2 N in toluene, 9 mL, 18 mmol) were added sequentially. The reaction mixture was stirred at ambient temperature for about 30 min then HCl (1 N aqueous, 50 mL) was added dropwise and the reaction mixture was stirred for about 30 min. The layers were separated and the aqueous portion was extracted with EtOAc (2×100 mL). The combined organic extracts were washed with water (10 mL), saturated aqueous NaHCO3 (15 mL), brine (15 mL) and dried over anhydrous MgSO4, filtered, and coned under reduced pressure. The residue was purified using silica gel chromatography (40 g) eluting with 100% EtOAc to give (1S,2R,4S)-2-ethyl-4-hydroxy-N′-(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)cyclopentanecarbohydrazide (1.887 g, 71%): LC/MS (Table 1, Method b) Rt=2.05 min; MS m/z: 444 (M+H)+.

1. temperaturethen cooled to ambient temperature
2. stirringthe reaction mixture was stirred for about 30 min
3. customThe layers were separated
4. extractionthe aqueous portion was extracted with EtOAc (2×100 mL)
5. washThe combined organic extracts were washed with water (10 mL), saturated aqueous NaHCO3 (15 mL), brine (15 mL)
6. dry with materialdried over anhydrous MgSO4
7. filtrationfiltered
8. customThe residue was purified
9. washeluting with 100% EtOAc