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First asymmetric cascade reaction catalysed by chiral primary aminoalcohols

Posted November 16th, 2011 by xbarril
TitleFirst asymmetric cascade reaction catalysed by chiral primary aminoalcohols
Publication TypeJournal Article
Year of Publication2011
AuthorsArroniz, C, Escolano C, Luque FJ, Bosch J, Amat M
JournalOrganic & biomolecular chemistry
Volume9
Issue14
Pagination5079 - 5085
Date Published2011/07/21/
KeywordsAlcohols/chemistry;, Amino, Catalysis;, Cyclohexanones/chemical, Diamines/chemistry;, Molecular, Quantum, Stereoisomerism, Structure;, synthesis/chemistry;, Theory;
AbstractReadily available chiral primary 1,2-aminoalcohols and diamines have been explored as organocatalysts for a domino Michael-aldol reaction. Their application in this organocascade process afforded cyclohexanone A with high levels of reactivity (up to 91% yield) and stereoselectivity (>97 : 3 d.r., up to 93% ee). Depending on the acid cocatalyst different chiral species (cyclic secondary amines vs. acyclic primary amines) might catalyse the process. In order to shed light on the catalytic activation, several experiments were carried out and a detailed possible reaction mechanism is proposed. Theoretical studies support the stereochemical outcome of the process.