反应详情

A −78° C. solution of 1-methoxycyclopentanecarboxamide (0.9 g, 6.29 mmol) in THF (40 mL), under Ar, was treated with LiHMDS (1M in THF, 8.17 mL, 8.17 mmol), stirred for 0.5 h, treated with a solution of isopropenyl chloroformate (0.824 mL, 7.54 mmol) in THF (5 mL), stirred at −78° C. for 15 min, warmed to RT and stirred for 1 h. The mixture was treated with satd. NH4Cl, the layers separated and the aqueous layer extracted with EtOAc (1×). The combined organics were washed with brine, dried over Na2SO4 and concentrated to dryness to afford crude prop-1-en-2-yl (1-methoxycyclopentanecarbonyl)carbamate (1.5 g, 105%) which was used without further purification. MS (ESI) m/z: 228.1 (M+H+).

1. stirringstirred at −78° C. for 15 min
2. stirringstirred for 1 h
3. additionThe mixture was treated with satd
4. customNH4Cl, the layers separated
5. extractionthe aqueous layer extracted with EtOAc (1×)
6. washThe combined organics were washed with brine
7. dry with materialdried over Na2SO4
8. concentrationconcentrated to dryness