α,β-Unsaturated Carboxylic Acid Derivatives. XI. Convenient Synthesis of<i>tert</i>-Butyl 2-Alkoxy- and Hydroxy-2-acetylamino-3-mono- or 3,3-dihaloalkanoates
作者:Chung-gi Shin、Yoshiaki Sato、Juji Yoshimura
DOI:10.1246/bcsj.49.1909
日期:1976.7
It was found that the halogenation of t-butyl 2-acetylamino-3-bromo-2-alkenoate (3) by NBS or NCS gave t-butyl 2-acetylimino-3,3-dihaloalkanoate (6 and 7). The addition of water or several saturated, unsaturated and polyhydric alcohols to the carbon-nitrogen double bond of 6 or 7 was accomplished to give t-butyl 2-acetylamino-2-alkoxy- and hydroxy-3,3-dihaloalkanoate. Similarly, the treatment of t-butyl 2-bromoacetylamino-2-alkenoate in alcohol gave t-butyl 2-acetylamino-2-alkoxy-3-bromoalkanoate, via the addition of alcohol to the imino intermediate (2). The formation mechanism and the structural assignment are discussed.
研究发现,用 NBS 或 NCS 卤化 2-乙酰氨基-3-溴-2-烯酸叔丁酯(3),可得到 2-乙酰亚氨基-3,3-二卤烷酸叔丁酯(6 和 7)。在 6 或 7 的碳氮双键上加入水或几种饱和、不饱和和多元醇,可得到 2-乙酰氨基-2-烷氧基和羟基-3,3-二卤烷酸叔丁酯。同样,在醇中处理 2-溴乙酰氨基-2-烯酸叔丁酯,通过醇与亚氨基中间体(2)的加成,得到 2-乙酰氨基-2-烷氧基-3-溴烷酸叔丁酯。本文讨论了其形成机理和结构分配。