Iminium ion cascade reactions: stereoselective synthesis of quinolizidines and indolizidines
作者:Shawn M. Amorde、Ivan T. Jewett、Stephen F. Martin
DOI:10.1016/j.tet.2008.10.074
日期:2009.4
A noveliminiumion cascade reaction has been developed that allows for the stereoselective synthesis of a variety of substituted aza-fused bicycles. The combination of amino allylsilanes and aldehydes (or ketones) was used to synthesize a number of quinolizidines and indolizidines in a one-pot reaction sequence. This technology has been used to effect the facile syntheses of several indolizidine and
Diversity-Oriented Synthesis of Bioactive Azaspirocycles
作者:Lance T. Lepovitz、Stephen F. Martin
DOI:10.1016/j.tet.2019.130637
日期:2019.11
A collection of novel azaspirocyclic β-arylethylamines was prepared in good yield and excellent diastereoselectivity by an expedient strategy that features condensation of a cyclic ketone with an amino allylsilane and a tandem aza-Sakurai cyclization to generate several different spirocyclic N-heterocycles. Subsequent elaboration of the spirocyclic scaffold was achieved via Pictet-Spengler cyclizations
An efficient route to 4-(substituted benzyl)piperidines
作者:Bartłomiej Furman、Magdalena Dziedzic
DOI:10.1016/j.tetlet.2003.09.075
日期:2003.11
A novel approach to 4-(substituted benzyl)piperidines has been developed. The key steps involve the cyclization of imines bearing an allylsilane in the side-chain followed by the palladium-catalyzed cross-coupling of the resulting 4-methylenepiperidine with organoboronic acids under an atmosphere of oxygen.
Facile entry to substituted 2-arylpiperidines via an aza-Sakurai reaction
作者:Alex M. Goodnough、James J. Sahn、Stephen F. Martin
DOI:10.1016/j.tetlet.2020.151777
日期:2020.4
An efficient route has been developed for the facile synthesis of functionalized 2-arylpiperidines that may be readily modified using straightforward transformations to create collections of novelsubstituted 2-arylpiperidines. The approach features a reaction cascade starting with imine formation from a known amino allylsilane and a diverse set of aryl aldehydes, followed by an acid-catalyzed aza-Sakurai
Cascade Iminium Ion Reactions for the Facile Synthesis of Quinolizidines. Concise Syntheses of (±)-Epilupinine and (−)-Epimyrtine
作者:Shawn M. Amorde、Andrew S. Judd、Stephen F. Martin
DOI:10.1021/ol050544b
日期:2005.5.1
Several novel cascade processes have been designed and developed that involve sequential reactions of imines and iminium ions to form substituted quinolizidine ring systems in a single step from simple and readily available starting materials. The utility and promise of these cascade reactions is evident from their application to extraordinarily concise syntheses of the representative quinolizidine alkaloids epilupinine and (-)-epimyrtine.