A practical synthesis of the potential chemotherapeutic agent L-azatyrosine is described. The key step involved the alkylation of (R,R)-(-)-pseudoephedrine glycinamide with 5-benzenesulfonyloxy-2-iodomethylpyridine and proceeded in 70-95% yield and 89-95% de. Simultaneous hydrolysis of the auxiliary and the benzenesulfonate protecting group afforded L-azatyrosine of .gtoreq.99% ee in 73% yield on multigram scale (recovery yield of (R,R)-(-)-pseudoephedrine: 90%).
本文描述了一种潜在的化疗药物L-azatyrosine的实用合成方法。关键步骤涉及使用5-苯磺氧基-2-
碘甲基吡啶与(R,R)-(-)-假
麻黄碱甘
氨酸进行烷基化反应,反应产率为70-95%,对映选择性为89-95%。辅助基和
苯磺酸保护基的同时
水解在多克级别上得到了.gtoreq.99% ee的L-azatyrosine,收率为73%((R,R)-(-)-假
麻黄碱甘
氨酸的回收率为90%)。