Diversity-oriented synthesis of bicyclic and tricyclic alkaloids
作者:Mónica Díaz-Gavilán、Warren R. J. D. Galloway、Kieron M. G. O’Connell、James T. Hodkingson、David R. Spring
DOI:10.1039/b917965h
日期:——
A diversity-oriented synthesis involving a cascade sequence, taking linear aminoalkenes to polycyclic scaffolds reminiscent of natural alkaloids, is presented.
Synthesis of substituted piperidines by enantioselective desymmetrizing intramolecular aza-Michael reactions
作者:Marta Guerola、Marcos Escolano、Gloria Alzuet-Piña、Enrique Gómez-Bengoa、Carmen Ramírez de Arellano、María Sánchez-Roselló、Carlos del Pozo
DOI:10.1039/c8ob01139g
日期:——
An organocatalytic enantioselective intramolecularaza-Michaelreaction has been described for the first time in a desymmetrization process employing substrates different from cyclohexadienones. By using 9-amino-9-deoxy-epi-hydroquinine as the catalyst and trifluoroacetic acid as a co-catalyst, a series of enantiomerically enriched 2,5-and 2,6-disubstituted piperidines have been obtained in good yields