Enantioselective Synthesis and in Vivo Evaluation of Regioisomeric Analogues of the Antimalarial Arterolane
作者:Brian R. Blank、Jiri Gut、Philip J. Rosenthal、Adam R. Renslo
DOI:10.1021/acs.jmedchem.7b00699
日期:2017.7.27
systematic study of antimalarial 1,2,4-trioxolanes bearing a substitution pattern regioisomeric to that of arterolane. Conformational analysis suggested that trans-3″-substituted trioxolanes would exhibit Fe(II) reactivity and antiparasitic activity similar to that achieved with canonical cis-4″ substitution. The chiral 3″ analogues were prepared as single stereoisomers and evaluated alongside their 4″
A General Organocatalytic Enantioselective Malonate Addition to α,β-Unsaturated Enones
作者:Veit Wascholowski、Kristian Rahbek Knudsen、Claire E. T. Mitchell、Steven V. Ley
DOI:10.1002/chem.200800673
日期:2008.7.7
A general enantioselective organocatalytic conjugate addition procedure of a variety of malonates to alpha,beta-unsaturated enone systems is presented. The reaction is efficiently catalysed by the pyrrolidinyl tetrazole catalyst 1. Cyclic, acyclic and aromatic enones can be used and the reaction with ethyl malonates 3 b provides the Michaeladdition products in high yields with good to excellent enantioselectivities
Asymmetric michael additions of ester enolates to enantiomerically pure vinylic sulfoxides
作者:Gary H. Posner、Moshe Weitzberg、Terence G. Hamill、Edward Asirvatham、He Cun-heng、Jon Clardy
DOI:10.1016/s0040-4020(01)90581-2
日期:1986.1
donors to enantiomerically pure Michael acceptor cycloalkenone sulfoxides 1a and 1b and unsaturated lactone sulfoxides 3a and 3b. The level of asymmetric induction in some cases is extraordinarily high (95% e.e. of final 1,5-dicarbonyl products). Adduct ester lactones 5 and 6 can be converted easily into some synthetically versatile, trifunctional, 3-substituted glutarate esters of highenantiomeric purity
Stereoselective synthesis of (+)-2-deoxyolivin based on cycloaddition reaction between the homophthalic anhydride and the chiral cyclohexenone derivative
tricyclic aglycon core, olivin. In this study, we established the efficient synthesis of the anthracenone core skeleton based on a cycloaddition reaction between the homophthalic anhydride and the chiral cyclohexenone derivatives, which is promoted by the combined use of molecular sieves, proton sponge, and a Lewisacid. The cyclohexenone with four chiral centers was synthesized by asymmetric and diastereoselective
containing chiral auxiliary have been employed to bring about 1,4-addition reactions to enones. These reactions generate δ-oxo-α-seleno esters in good yields and with excellent regio- and diastereoselectivities. The results obtained clearly indicate that the Lewis acids, employed to activate the starting enones towards addition, greatly influence reactivity as well as the stereochemical outcomes of