A stereoselective sequential organocascade and multicomponent approach for the preparation of tetrahydropyridines and chimeric derivatives
作者:Radell Echemendía、Gustavo P. da Silva、Meire Y. Kawamura、Alexander F. de la Torre、Arlene G. Corrêa、Marco A. B. Ferreira、Daniel G. Rivera、Márcio W. Paixão
DOI:10.1039/c8cc06871b
日期:——
A stereoselective multicomponent approach leading to a novel class of pentasubstituted tetrahydropyridines is described. Variation of the components enabled the incorporation of peptide, sugar and steroid moieties to access chimeric derivatives. DFT calculations provide insights about the unprecedented high diastereoselectivity of the MCR.
Bifunctional (Thio)urea–Phosphine Organocatalysts Derived from d-Glucose and α-Amino Acids and Their Application to the Enantioselective Morita–Baylis–Hillman Reaction
Novel (thio)urea–tertiary phosphines were developed for use as bifunctional organocatalysts readily available from naturally occurring molecules: saccharides and amino acids. The efficiency of the organocatalysts was demonstrated in the asymmetricMorita–Baylis–Hillman (MBH) reaction of aromatic aldehydes with acrylates. The MBH products were obtained in good yields (up to 85%) and with high enantioselectivities