反应详情

Et3N (54.34 mg, 74.85 μL, 0.5370 mmol) was added to a solution of tert-butyl N-tert-butoxycarbonyl-N-[3-ethynyl-5-(4-isopropylsulfonylphenyl)pyrazin-2-yl]carbamate 4 (224.5 mg, 0.4475 mmol) and tert-butyl (3R)-3-[4-[(Z)—C-chloro-N-hydroxy-carbonimidoyl]phenyl]morpholine-4-carboxylate 13 (183 mg, 0.5370 mmol) in THF (4 mL) and the resulting solution stirred at rt for 30 min and then heated at 65° C. for 2 h. The reaction mixture was cooled to room temperature and concentrated in vacuo. The residue was purified by column chromatography on silica, using the ISCO column companion system, eluting with ethyl acetate/petroleum ether (0-50% EtOAc, 8 g column) Product began to elute at 33% EtOAc. Product fractions were combined and concentrated in vacuo to leave the product as a cream coloured solid (144 mg, 40% yield); 1.20 (6H, d), 1.30 (18H, s), 1.42 (9H, s), 3.07 (1H, m), 3.50-3.60 (3H, m), 3.73-3.85 (3H, m), 4.32 (1H, m), 5.06 (1H, s), 7.53 (2H, m), 8.07 (5H, m), 8.64 (2H, m) and 9.51 (1H, s) ppm

1. temperatureheated at 65° C. for 2 h
2. temperatureThe reaction mixture was cooled to room temperature
3. concentrationconcentrated in vacuo
4. customThe residue was purified by column chromatography on silica
5. washeluting with ethyl acetate/petroleum ether (0-50% EtOAc, 8 g column) Product
6. washto elute at 33% EtOAc
7. concentrationconcentrated in vacuo