5-<<(tert-butyloxycarbonyl)amino>methyl>-2-isoxazolin-3-ol 、
溴乙烷 以to afford the O-alkylated product (18 mg), 1HNMR (CDCl3, 400 MHz): 4.90 (m, 1H), 4.70 (m, 1H), 4.2 (q, 2H), 3.35 (m, 2H), 3.00 (dd, 1H), 2.75 (dd, 1H), 1.50 (s, 9H), 1.35 (t, 3H)的产率得到(2-ethyl-3-oxo-isoxazolidin-5-ylmethyl)-carbamic acid tert-butyl ester