Indium-Mediated 1,2,4,5-Hexatetraen-3-ylation of 4-Acetoxy-2-azetidinones and Their Applications to the Diels−Alder Reactions for the Synthesis of 2-Azetidinone Derivatives
作者:Heashim Yu、Phil Ho Lee
DOI:10.1021/jo800594y
日期:2008.7.1
6-dibromo-2,4-hexadiyne in the presence of LiCl in DMF to selectively produce 2-azetidinones possessing 1,2,4,5-hexatetraen-3-yl group on the C4-position. The Diels−Alder reactions of 4-(1,2,4,5-hexatetraen-3-yl)-2-azetidinones with a variety of dienophiles and subsequent aromatizations afforded valuable functional group-substituted 2-azetidinones in good yields.
4-乙酰氧基-2-氮杂环丁酮与在DMF中的LiCl存在下由铟和1,6-二溴-2,4-己二炔原位生成的有机铟试剂反应,选择性地生成具有1,2,4,5-的2-氮杂环丁酮C4位上的hexatetraen-3-yl。4-(1,2,4,5-六丁烯-3-基)-2-氮杂环丁烷酮与多种亲二烯体的狄尔斯-阿尔德反应和随后的芳构化反应以高收率提供了有价值的官能团取代的2-氮杂环丁烷酮。