反应详情

To a mixture of cyclopropylmethanol (7.15 ml, 90 mmol), di-tert-butyl hydrazine-1,2-dicarboxylate (6.30 g, 27.1 mmol) and triphenylphosphine (28.5 g, 109 mmol) in THF (100 mL) was added di-tert-butyl azodicarboxylate (25 g, 109 mmol) portion wise at ambient temperature. The mixture was stirred for 2 hours then concentrated. Solid triphenylphosphineoxide was removed by filtration. The filtrate was concentrated and the residue was purified by flash chromatography (silica gel, eluted with a gradient of 5-25% EtOAc in hexane) to provide 27.5 g (96%) of title compound. 1H NMR (300 MHz, CDCl3) δ ppm 0.15-0.26 (m, 2H), 0.42-0.54 (m, 2H), 0.91-1.09 (m, 1H), 1.47 (s, 9H), 1.48 (s, 9H), 3.31 (d, J=6.10 Hz, 2H), 6.38 (s, 1H).

1. concentrationthen concentrated
2. customSolid triphenylphosphineoxide was removed by filtration
3. concentrationThe filtrate was concentrated
4. customthe residue was purified by flash chromatography (silica gel
5. washeluted with a gradient of 5-25% EtOAc in hexane)