Abstract3‐Substituted‐2H‐1,4‐benzoxazines undergo a highly enantioselective direct Mannich reaction with acetone in the presence of an L‐proline catalyst at room temperature. The corresponding N‐heterocycles with α‐tetrasubstituted carbon stereocenters were obtained in good yields (48–92%) and excellent enantioselectivity (up to >99% ee). Furthermore, a novel modification involving the diastereoselective reduction of the Mannich adduct was carried out leading to the formation of a 1,3‐amino alcohol with a chiral tetrasubstituted carbon stereocenter in high yield.magnified image
2-Alkenyl-3-hydroxyquinolin-4(1H)-ones were prepared by the rearrangement of anthranilic acid esters synthesized by two alternative methods. The prepared derivatives were screened for their antimicrobial activities against representative Gram-positive and Gram-negative bacteria, displaying notable minimum inhibitory concentration values against specific strains. The emission spectra of the target quinolines
Synthesis and antiproliferativeactivity of new vinca alkaloids containing an α,β-unsaturated aromatic side chain
作者:Quoc Anh Ngo、Le Anh Nguyen、Ngoc Binh Vo、Thuy Hang Nguyen、Fanny Roussi、The Hung Nguyen、Van Tuyen Nguyen
DOI:10.1016/j.bmcl.2015.10.040
日期:2015.12
A new series of vinca-alkaloids derivatives containing various alpha,beta-unsaturated aromatic side chains was synthesized. Four new vinca-alkaloids derivatives showed selective cytotoxicities against KB tumor cell lines with IC50 value below 0.1 mu M, thus comparable with vinblastine. (C) 2015 Elsevier Ltd. All rights reserved.