The organocatalytic synthesis of quinolizidine alkaloids (+)-myrtine, (-)-lupinine, and (+)-epiepiquinamide is described. It involved, as the key step, an enantioselective intramolecular aza-Michael reaction (IMAMR) catalyzed by Jorgensen catalyst I, affording the common precursor with high enantioselectivity. This compound was subsequently transformed into the three alkaloids in a highly diastereoselective manner. (C) 2011 Elsevier Ltd. All rights reserved.
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Charles Univ Prague, Dept Organ Chem, Fac Sci, Prague 12843, Czech RepublicCharles Univ Prague, Dept Organ Chem, Fac Sci, Prague 12843, Czech Republic
Vesely, Jan
Rios, Ramon
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Charles Univ Prague, Dept Organ Chem, Fac Sci, Prague 12843, Czech Republic
Univ Barcelona, Dept Quim Organ, E-08028 Barcelona, Spain
UB, ICREA, Barcelona 08014, SpainCharles Univ Prague, Dept Organ Chem, Fac Sci, Prague 12843, Czech Republic