Tuning the Reaction Paths in Palladium(0)-Catalyzed Coupling−Cyclization Reaction of β-Amino Allenes with Organic Halides: A Substituent Switch
作者:Shengming Ma、Wenzhong Gao
DOI:10.1021/ol026406t
日期:2002.8.1
[reaction: see text] Substituent effects on the allene moiety and the N-protecting group were found to be the dominant factor in determining the reactionpaths in the Pd(0)-catalyzed coupling-cyclization reaction of beta-amino allenes with organichalides.
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.