An efficient entry to highly substituted chiral 2-oxopiperazines from α-amino acids via iodocyclization
作者:Amit Kumar Jana、Sanjit Kumar Das、Gautam Panda
DOI:10.1016/j.tet.2012.09.109
日期:2012.12
A short and stereoselective route for the synthesis of 2-oxopiperazines is presented starting from different naturally abundant α-amino acids. The key synthetic steps involved amide coupling, Wittig reaction, HWE olefination, aza-Michael reaction, iodocyclization. This new pathway involving first report of iodocyclization to construct chiral substituted 2-oxopiperazines furnished final compounds in
从不同的自然丰富的α-氨基酸开始,提出了合成2-氧代哌嗪的短而立体的选择性途径。关键的合成步骤涉及酰胺偶联,Wittig反应,HWE烯烃化,氮杂-迈克尔反应,碘环化。这个新的途径涉及首次报道的碘环化以构建手性取代的2-氧杂哌嗪,从而以高收率提供了最终化合物。