Described herein is an efficient copper-catalyzed tandem alkyne indolylcupration-initiated 1,2-indole migration/6π-electrocyclic reaction of allene-ynamides with indoles by the in situ-generated metal carbenes. This method allows the efficientsynthesis of valuable indole-fused spirobenzo[f]indole-cyclohexanes with high regio- and stereoselectivity. In addition, this reaction affords rapid access to
本文描述的是通过原位生成的金属卡宾进行的铜催化串联炔吲哚基引发的丙二烯-炔酰胺与吲哚的1,2-吲哚迁移/6π-电环反应。该方法可以有效合成具有高区域和立体选择性的有价值的吲哚稠合螺苯并[ f ]吲哚环己烷。此外,该反应可以在不存在吲哚的情况下,通过含铜全碳1,4-偶极子进行可能的5-exo-dig环化/弗里德尔-克来福特烷基化,快速获得官能化的螺苯并[ f ]吲哚-环己烷。
Studies on Pd(II)-Catalyzed Coupling−Cyclization of α- or β-Amino Allenes with Allylic Halides
作者:Shengming Ma、Fei Yu、Wenzhong Gao
DOI:10.1021/jo0342469
日期:2003.7.1
The palladium-catalyzed coupling-cyclization of alpha- or beta-amino allenes with allylic halides leading to 3-allylic 2,5-dihydropyrroles and 1,2,3,6-tetrahydropyridines, respectively, was studied. The starting materials are easily available. The skeletons of both two classes of products were established by the X-ray diffraction studies of 7i and 9b. Through the study of the reaction of 2b with 3-chloro-1-butene, 1-chloro-2-butene, and pi-allyl palladium species and the stereochemical outcome of the coupling cyclization of (S)-2m and (R)-2n, it is believed that the current transformation most likely proceeded via a Pd(II)-catalyzed pathway, although a Pd(0) pathway cannot be completely excluded.