Synthesis of Highly Substituted Pyrroles via a Multimetal-Catalyzed Rearrangement−Condensation−Cyclization Domino Approach
作者:Jörg T. Binder、Stefan F. Kirsch
DOI:10.1021/ol060664z
日期:2006.5.1
[reaction: see text] In a convenient one-pot process, easily accessed propargyl vinyl ethers and aromatic amines are effectively converted into tetra- and pentasubstituted 5-methylpyrroles which can further be transformed into 5-formylpyrroles via IBX-mediated oxidation. The cascade reaction proceeds through a silver(I)-catalyzed propargyl-Claisen rearrangement, an amine condensation, and a gold(I)-catalyzed
[反应:见正文]在方便的一锅法中,容易获得的炔丙基乙烯基醚和芳族胺被有效地转化为四取代和五取代的5-甲基吡咯,然后可以通过IBX介导的氧化将其进一步转化为5-甲酰基吡咯。级联反应通过银(I)催化的炔丙基-克莱森重排,胺缩合和金(I)催化的5-exo-dig杂环化进行。