Combination of Rearrangement with Metallic and Organic Catalyses - a Step- and Atom-Economical Approach to α-Spiroactones and -lactams
作者:Thomas Boddaert、Yoann Coquerel、Jean Rodriguez
DOI:10.1002/ejoc.201100734
日期:2011.9
3-dicarbonyl compounds, (homo)allylic alcohols or amines and acrylic derivatives, involving a single consecutive reaction consisting of a Wolff rearrangement/α-oxo ketene trapping/cross metathesis/Michaeladditionsequence is described. During the consecutive reaction optimization, the organocatalyticactivity of N,N-diaryl-1,3-imidazol(in)-2-ylidene N-heterocycliccarbenes (NHCs) in the Michaeladdition of
A New Multicomponent Domino Transformation of 1,3-Dicarbonyl Compounds: One-Pot Regio-, Chemo- and Stereoselective Access to Valuable α,γ-Difunctionalized α-Ketoesters and Amides
A new multi-component transformation between 1,3-dicarbonyls 1, aldehydes 2, and allylic, propargylic or benzylic halides 3 is described. It provides a regio-, chemo- and stereoselective one-pot access to α,γ-difunctionalized α-ketoesters and amides 4, bearing a quaternary center valuable for further synthetic transformations via ring-closing metathesis to give azaspiro systems found in bioactive natural
Intramolecular Ene Reactions. Stereo- and Enantioselective Synthesis of Spirolactams through Thermolysis of Enamino Carboxamides
作者:Janine Cossy、Abdelrrahim Bouzide、Michel Pfau
DOI:10.1021/jo970257o
日期:1997.10.1
thermal rearrangement of tertiary and secondary enamino carboxamides has been developed. The enamine group of an enamino carboxamide, in which no electron-withdrawing group is present in the enophile, can be involved in the ene reaction and the enamino carboxamide can be transformed into enamino or imino spirolactams. In the case of secondary carboxamido enamines, the diastereoselectivity is higher than 98%
Stereoselective formation of spirolactams by intramolecular ene reaction
作者:J. Cossy、A. Bouzide
DOI:10.1016/s0040-4039(00)92226-3
日期:1992.4
A new and facile access to spirolactams based on the thermal rearrangements of N,N-unsaturated dialkyl-β-ketoamides and N,N-unsaturated dialkyl enaminoamides has been developed.