A concise synthesis of optically active trytophan derivatives was developed via diastereoselective alkylation of the Schöllkopf chiral auxiliary 4 to provide alkyne 2 which underwent palladium-catalyzed heteroannulation with iodoanilines 1 to furnish protected tryptophans 3. Hydrolysis and subsequent saponification of 3 provided the desired tryptophans 12 in good yields.
通过Schöllkopf手性助剂4的非对映选择性烷基化开发了一种光学活性色
氨酸衍
生物的简明合成方法,以提供炔2,后者与
碘代
苯胺1进行
钯催化的杂环化反应,从而提供受保护的色
氨酸3。
水解和随后的皂化3提供所需的色
氨酸12以良好的收率。