开发了一种多米诺缩合环化方法,使用 P 4 O 10 /TfOH 试剂系统合成吲哚里西啶生物碱,无需使用催化剂或溶剂。显示了一些脂肪族和芳香族二羧酸以及各种伯胺的使用。该方法适用于合成吡咯并[2,1- a ]异喹啉、吡啶并[2,1- a ]异喹啉和异吲哚[1,2- a ]异喹啉酮,收率良好。当使用邻苯二甲酸时,使用 NaBH 4或饱和 NaHCO 3溶液进行后处理得到 12 b -H 或 12 b -OH 异吲哚[1,2- a]异喹啉酮,分别。
Synthesis of Heterocycles through a Ruthenium-Catalyzed Tandem Ring-Closing Metathesis/Isomerization/N-Acyliminium Cyclization Sequence
作者:Erhad Ascic、Jakob F. Jensen、Thomas E. Nielsen
DOI:10.1002/anie.201100417
日期:2011.5.23
Tandem bicycle: In the title reaction double bonds created during ring‐closingmetathesis isomerize to generate reactive iminium intermediates that undergo intramolecular cyclization reactions with tethered heteroatom and carbon nucleophiles. In this way, a series of biologically interesting heterocyclic compounds can be made, including a known precursor for the total synthesis of the antiparasitic