Two exceptional lithiations in the chromone series
作者:Ana M. B. S. R. C. S. Costa、Francis M. Dean、Michael A. Jones、Dennis A. Smith
DOI:10.1039/c39830001098
日期:——
di-isopropylamide in tetrahydrofuran at –70 °C followed by pivaloyl chloride the 2-pivaloylmethyl-3-methoxymethylchromone (1) affords by a novel aromatic substitution the 8-pivaloylchromone (3); lithiation of the 2-(2-furyl)chromone (7) with one mol. Equiv. of the reagent followed by carbonation leads not to monocarboxylic acids but to a 50% yield of the dicarboxylic acid (8).
Transcription factor modulating compounds and methods of use thereof
申请人:Levy Stuart B.
公开号:US20090131401A1
公开(公告)日:2009-05-21
Substituted benzoimidazole compounds useful as anti-infectives that decrease resistance, virulence, or growth of microbes are provided. Methods of making and using substituted benzoimidazole compounds, as well as pharmaceutical preparations thereof, in, e.g., reducing antibiotic resistance and inhibiting biofilms.
Pyrrolidine and iodine catalyzed domino aldol-Michael-dehydrogenative synthesis of flavones
作者:Mayuri M. Naik、Santosh G. Tilve、Vijayendra P. Kamat
DOI:10.1016/j.tetlet.2014.04.051
日期:2014.5
A one pot synthesis of flavones is established from 2′-hydroxyacetophenones and substituted aromatic aldehydes. The method uses domino aldol-Michael-oxidation reactioncatalyzed by pyrrolidine as a base and iodine as an oxidant in dimethyl sulfoxide.
Kinetic and thermodynamic control in the lithiation of 2,6-dimethylchromone, and selective lithiations in 2-(x-furyl)chromones and in furanochromones related to khellin
作者:Anna M. B. S. R. C. S. Costa、Francis M. Dean、Michael A. Jones、Dennis A. Smith
DOI:10.1039/p19860001707
日期:——
The addition of 2,6-dimethylchromone to lithium di-isopropylamide (LDA) allows formation, under thermodynamiccontrol, of the 2-methylene carbanion (3), but this seems to react at the carbonyl oxygen atom with carbon dioxide so no carboxylic acid can be isolated. With ethyl chloroformate (but not diethyl carbonate) this carbanion does afford the expected ethyl chromon-2-ylacetate (1d). The chromonylacetic