Tandem Organocatalytic Cycloaromatization/Intramolecular Friedel–Crafts Alkylation Sequence for the Synthesis of Indolizinones and Pyrrolo-azepinone Derivatives
作者:Fernando Rabasa-Alcañiz、María Sánchez-Roselló、Santos Fustero、Carlos del Pozo
DOI:10.1021/acs.joc.9b01314
日期:2019.9.6
The organocatalytic synthesis of indolizinones and pyrrolo-azepinones has been accomplished in a tandem fashion through a sequence that comprises initial cycloaromatization followed by intramolecular Friedel–Crafts alkylation. The process takes place under Brønsted acid catalysis, giving rise to final products in moderate to good yields. Attempts to carry out the tandem protocol in an enantioselective
吲哚并酮和吡咯并-氮杂环庚酮的有机催化合成已通过一系列顺序完成,该顺序包括初始的环芳构化反应以及随后的分子内Friedel-Crafts烷基化反应。该过程在布朗斯台德酸催化下进行,从而以中等至良好的产率产生最终产物。尝试以手性(R)-BINOL衍生的N -triflyl磷酰胺以对映选择性方式进行串联方案。初步优化后,串联过程以中等水平的对映选择性进行。