反应详情

温度

0 °C

NaH (60% dispersion in mineral oil, 0.041 g, 1.0 mmol) was added to anhydrous DMF (5 mL). The suspension was cooled to about 0° C. and a solution of tert-butyl 5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-ylcarbamate (0.40 g, 1.0 mmol) in anhydrous DMF (5 mL) was added drop-wise. The reaction mixture was allowed to warm to ambient temperature and (R)-(9H-fluoren-9-yl)methyl 3-(2-bromoacetyl)piperidine-1-carboxylate (0.441 g, 1.03 mmol, Preparation #LL.1) was added. The reaction mixture was stirred for about 30 min before it was partitioned between EtOAc (30 mL) and brine (2×100 mL). The organic layer was dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel chromatography (12 g column) eluting with a gradient of 10-50% EtOAc in heptane to give (R)-(9H-fluoren-9-yl)methyl-3-(2-(tert-butoxycarbonyl(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)amino)acetyl)piperidine-1-carboxylate as a clear oil (0.21 g, 26%): LC/MS (Table 2, Method a) Rt=3.16 min; MS m/z: 736 (M+H)+.

1. temperatureto warm to ambient temperature
2. customwas partitioned between EtOAc (30 mL) and brine (2×100 mL)
3. dry with materialThe organic layer was dried over anhydrous Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel chromatography (12 g column)
7. washeluting with a gradient of 10-50% EtOAc in heptane