Mild deacetylation of 1,3-dicarbonyl compounds was achieved by halonium-ion mediated electrolysis. In this reaction, the supporting electrolyte including sodium halide NaX (X = Cl or Br) was essential since the reaction proceeded through substitution by a halonium ion, generated electrochemically at anode, on active methine carbons followed by base-catalyzed deacetylation, and was terminated by reductlve dehalogenation of the formed α-halo carbonyl compounds at cathode.
Photochemical rearrangements of .alpha.-methylene ketones
作者:Russell A. Cormier、William L. Schreiber、William C. Agosta
DOI:10.1021/ja00796a019
日期:1973.7
Condensations. XIX. The Alkylation of β-Keto Esters with Alcohols and Ethers in the Presence of Boron Trifluoride<sup>1,2</sup>
作者:Joe T. Adams、B. Abramovitch、Charles R. Hauser
DOI:10.1021/ja01244a016
日期:1943.4
Über in 3-Stellung substituierte Tetronsäuren. II. Mitteilung: Tetronsäurederivate
作者:Benno Reichert、H. Schäfer
DOI:10.1002/ardp.19582910407
日期:——
Endochin Optimization: Structure−Activity and Structure−Property Relationship Studies of 3-Substituted 2-Methyl-4(1<i>H</i>)-quinolones with Antimalarial Activity
作者:R. Matthew Cross、Andrii Monastyrskyi、Tina S. Mutka、Jeremy N. Burrows、Dennis E. Kyle、Roman Manetsch
DOI:10.1021/jm1007903
日期:2010.10.14
Since the 1940s endochin and analogues thereof were known to be causal prophylactic and potent erythrocytic stage agents in avian models. Preliminary screening in a current in vitro assay identified several 4(1H)-quinolones with nanomolar EC(50) against erythrocytic stages of mullidrug resistant W2 and TM90-C2B isolates of Plasmodium folciparum. Follow-up structure activity relationship (SAR) studies on 4(1H)-quinolone analogues identified several key features for biological activity. Nevertheless, structure property relationship (SPR) studies conducted in parallel revealed that 4(1H)-quinolone analogues are limited by poor solubilities and rapid microsomal degradations. To improve the overall efficacy, multiple 4(1H)-quinolone series with varying substituents on the benzenoid quinolone ring and/or the 3-position were synthesized and tested for in vitro antimalarial activity. Several structurally diverse 6-chloro-2-methyl-7-methoxy-4(1H)-quinolones with EC(50) in the low nanomolar range against the clinically relevant isolates W2 and TM90-C2B were identified with improved physicochemical properties while maintaining little to no cross-resistance with atovaquone.