Gold-Catalyzed Intramolecular Regio- and Enantioselective Cycloisomerization of 1,1-Bis(indolyl)-5-alkynes
作者:Long Huang、Hai-Bin Yang、Di-Han Zhang、Zhen Zhang、Xiang-Ying Tang、Qin Xu、Min Shi
DOI:10.1002/anie.201302632
日期:2013.6.24
Bis(indole) alkaloids analogues were prepared under mild conditions and in high yields through a gold‐catalyzed cycloisomerization of 1,1‐bis(indolyl)‐5‐alkynes (see scheme). The enantioselective version of this reaction gave the corresponding products in moderate to excellent yields (55–90 %), moderate to good ee values (48–96 %), and satisfactory regioselectivities (3.5:1→20:1).
evaluation of the chemical and stereochemical scope of the process in comparison with the Pauson-Khand cyclization of non-sulfonylated enynes, its application to the stereoselectivepreparation of optically pure C6-substituted bicyclo[3.3.0]oct-1-en-3-ones, and the interpretation of the stereochemical outcome are also discussed.
Nickel-catalyzed heterocycle construction with stereoselective exocyclic alkene introduction
作者:John Montgomery、Maxim V. Chevliakov、Harry L. Brielmann
DOI:10.1016/s0040-4020(97)01027-2
日期:1997.12
A series of monocyclic and bicyclic heterocycles with exocyclic alkenes were constructed in a stereoselective fashion by an organozinc/Ni(COD)2 - mediated cyclization of alkynyl enones. Both reductive and alkylative cyclization manifolds were accessible depending on the ligand and organozinc structure. Alkylative cyclizations were generally more efficient than reductive cyclizations, particularly with
[EN] [6+5] FUSED BICYCLES AS A THROMBIN ANTAGONIST, PROCESS FOR PREPARATION THEREOF AND PHARMACEUTICAL COMPOSITIONS CONTAINING THE BICYCLES<br/>[FR] BICYCLES FUSIONNÉS [6+5] EN TANT QU'ANTAGONISTES DE LA THROMBINE, PROCÉDÉ DE PRÉPARATION DE CEUX-CI ET COMPOSITIONS PHARMACEUTIQUES CONTENANT LES BICYCLES