Cyclohepta[b]indole derivatives 7 were prepared by subsequent aza-Claisen rearrangement and intramolecular ring-closure of (cycloheptenylmethyl)benzenamine ( 3 ). The mechanisms of the reactions are also discussed.
Congested C–C Bonds by Pd-Catalyzed Enantioselective Allyl–Allyl Cross-Coupling, a Mechanism-Guided Solution
作者:Michael J. Ardolino、James P. Morken
DOI:10.1021/ja502280w
日期:2014.5.14
Under the influence of a chiral bidentate diphosphine ligand, the Pd-catalyzed asymmetric cross-coupling of allylboron reagents and allylic electrophiles establishes 1,5-dienes with adjacent stereocenters in high regio- and stereoselectivity. A mechanistic study of the coupling utilizing reaction calorimetry and density functional theory analysis suggests that the reaction operates through an inner-sphere 3,3'-reductive elimination pathway, which is both rate-defining and stereodefining. Coupled with optimized reaction conditions, this mechanistic detail is used to expand the scope of allyl allyl couplings to allow the generation of 1,5-dienes with tertiary centers adjacent to quaternary centers as well as a unique set of cyclic structures.
Synthesis of Cycloalkanoindoles, the Carba Analogs of Physostigmine
β- and γ-Disubstituted Olefins: Substrates for Copper-Catalyzed Asymmetric Allylic Substitution
作者:Caroline A. Falciola、Karine Tissot-Croset、Hugo Reyneri、Alexandre Alexakis
DOI:10.1002/adsc.200800086
日期:2008.5.5
The copper-catalyzed asymmetric allylic alkylation has shown through many examples that it is a powerful means to generate stereogenic centers with mono β- and γ-substituted olefinic substrates. However, little has been reported about more substituted olefinic patterns, such as β-disubstituted allylic electrophiles. In this paper, we show that a simple procedure using easily accessible Grignard reagents
AbstractCarba analogs of physostigmine were prepared from aniline derivatives with BF .3 Et2O catalyzed cyclization. Suzuki coupling reactions of the new compounds are also discussed. Graphical abstract .
摘要从苯胺衍生物与高炉制备了毒扁豆碱的Carba类似物。3 Et 2 O催化环化。还讨论了新化合物的Suzuki偶联反应。 图形概要 。