CeCl<sub>3</sub>·7H<sub>2</sub>O Catalyzed C–C and C–N Bond-Forming Cascade Cyclization with Subsequent Side-Chain Functionalization and Rearrangement: A Domino Approach to Pentasubstituted Pyrrole Analogues
作者:Dipankar Dhara、Krishnanka S. Gayen、Saikat Khamarui、Palash Pandit、Sukla Ghosh、Dilip K. Maiti
DOI:10.1021/jo301796r
日期:2012.11.16
enaminioesters from β-keto esters and primary amines, activation of their allylic sp3 C–H, vinylic sp2 C–H and N–H bonds, multi C–C and C–N bond-forming cascade cyclization with 1,2-diketones and subsequent side-chain alkylation have been developed to construct functionalized pentasubstituted pyrroles and their chiral analogues. The scope of the domino reaction is successfully explored toward synthesis of highly
CeCl 3 ·7H 2 O被发现是良性反应条件下常见前体的三,四和七组分组装体的新分子间多米诺反应的有效催化剂。由β-酮酸酯和伯胺生成烯胺酸酯,激活其烯丙基sp 3 C–H,乙烯基sp 2已开发出C–H和N–H键,与1,2-二酮形成多个C–C和C–N键的级联环化以及随后的侧链烷基化反应,以构建功能化的五取代吡咯及其手性类似物。通过不同寻常的侧链胺化,消除和环收缩,成功地探索了多米诺反应的范围,以合成高度芳基取代的吡咯,带有C 2烯烃侧链的五取代吡咯和螺-2-吡咯烷酮及其手性类似物。新的多米诺骨牌反应操作简单,稳定,特定底物,选择性高收率。