反应详情

To a chilled (0°-5° C.) and stirred ethereal solution (500 ml) containing cyclopentyl amine (75 g, 0.88 mol) and triethyl amine (101 g, 1.0 mol) was added t-butyl bromoacetate (136.5 g, 0.7 mol) in ether (300 ml). The reaction mixture was stirred overnight. The ethereal mixture was then concentrated and the residue redissolved in methylene chloride (750 ml). This solution was washed with saturated aqueous sodium bicarbonate (1000 ml), water (2×3000 ml), and brine (2000 ml). The organic portion was separated, dried over MgSO4, filtered and evaporated yielding N-cyclopentylglycine t-butyl ester (92 g, 66%) as a brown oil which slowly crystallized on standing.

1. temperatureTo a chilled (0°-5° C.)
2. concentrationThe ethereal mixture was then concentrated
3. dissolutionthe residue redissolved in methylene chloride (750 ml)
4. washThis solution was washed with saturated aqueous sodium bicarbonate (1000 ml), water (2×3000 ml), and brine (2000 ml)
5. customThe organic portion was separated
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. customevaporated