Photochemical Reaction between Tertiary Allylic Amines and Chromium Carbene Complexes: Synthesis of Lactams via a Zwitterion Aza Cope Rearrangement
作者:Christopher J. Deur、Michael W. Miller、Louis S. Hegedus
DOI:10.1021/jo951829c
日期:1996.1.1
Photolysis of chromium carbene complexes in the presence of tertiary allylic amines resulted in a zwitterionic aza Cope rearrangement to produce unsaturated lactams in fair yield.
Alicyclic carboxylic acid derivatives of benzomorphans and related scaffolds, medicaments containing such compounds and their use
申请人:Peters Stefan
公开号:US20110269791A1
公开(公告)日:2011-11-03
The present invention relates to compounds defined by Formula (I), wherein the groups A, B, X, m, n and o are defined as in claim
1,
possessing valuable pharmacological activity. Particularly the compounds are inhibitors of 11β-hydroxysteroid dehydrogenase (HSD) 1 and thus are suitable for treatment and prevention of diseases which can be influenced by inhibition of this enzyme, such as metabolic diseases, in particular diabetes type 2, obesity and dyslipidemia.
A very efficient NHC-catalyzed lactamization reaction is reported. For most cases, the ringexpansion reaction proceeds to cleanly furnish five- and six-membered N-Ts and N-Bn lactams, without the need for further purification. Evidence is presented suggesting a dual role for the stoichiometric base: (1) deprotonation of the triazolium precatalyst and (2) activation of the nitrogen leaving group through
Tandem Conjugate Additions and 3-Aza-Cope Rearrangements of Tertiary Allyl Amines and Cyclic α-Vinylamines with Acetylenic Sulfones. Applications to Simple and Iterative Ring Expansions Leading to Medium and Large-Ring Nitrogen Heterocycles
作者:Mitchell H. Weston、Katsumasa Nakajima、Thomas G. Back
DOI:10.1021/jo800600a
日期:2008.6.1
Tertiary acyclic allyl amines and tertiary cyclic α-vinyl amines undergo conjugate additions to acetylenic sulfones to produce zwitterion intermediates, followed by 3-aza-Cope rearrangements. In the case of cyclic α-vinyl amines, the process results in ring-expansion, providing a novel route to 9- to 17-membered cyclic amines. The Hammett plot for the reaction of 8b with 2a−2f shows ρ = +1.19, which