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
An iterative approach to novel polyamines via nucleophilic ring-opening of aziridinium ions with β-amino alcohols
作者:Christopher McKay、Robert J. Wilson、Christopher M. Rayner
DOI:10.1039/b401447b
日期:——
An iterative procedure for the synthesis of a novel class of synthetic polyamines has been developed, utilising the regioselective ring-opening of aziridinium ion intermediates; facile N-allyl deprotection of intermediate polyamines allows the rapid construction of high molecular weight, stereochemically defined compounds in a convergent manner.
Diastereoselective Synthesis of Hexahydropyrrolo[2,1-b]oxazoles by a Rhodium-Catalyzed Hydroformylation / Silica-Promoted Deformylation Sequence
作者:Maxym Vasylyev、Howard Alper
DOI:10.1002/anie.200802550
日期:2009.2.2
Fleetingly formyl: A new rhodium‐catalyzed hydroformylation reaction of N‐allyl oxazolidines, carried out under a CO/H2 atmosphere, followed by a diastereoselective deformylative cyclization affords hexahydropyrrolo[2,1‐b]oxazoles in good yields. The reaction proceeds by a unique hydroformylation–deformylation sequence in which the formyl group virtually substitutes for the CH2O} fragment of the
迅速的甲酰基:在CO / H 2气氛下进行的新的铑催化的N-烯丙基恶唑烷的加氢甲酰化反应,然后进行非对映选择性的甲酰基化环化反应,可得到高产率的六氢吡咯并[2,1- b ]恶唑。通过其中甲酰基几乎替代为CH一个唯一的加氢甲酰化-脱甲酰序列反应进行2 ø}恶唑烷杂环的片段。