反应详情

A solution of Nα-Boc-Nδ-Cbz-ornithinol (363 mg) in dichloromethane (10 ml) at 0° C., under nitrogen atmosphere, was treated sequentially with methanesulfonyl chloride (110 μl, 1.4 eq) and triethylamine (200 μl, 1.4 eq). After 3 hrs, the solution was poured into dichloromethane and worked up as usual. The crude product, which is very pure (400 mg), is a white solid: 1H NMR (400 MHz, CDCl3) δ1.45 (s, 9H), 1.63 (m, 4H), 3.02 (s, 3H), 3.24 (m, 2H), 3.84 (m, 1H), 4.19 (dd, J=9.5; 3.7 Hz, 1H), 4.23 (d, J=9.5 Hz, 1H), 5.14 (s, 2H), and 7.39 (m, 5H).