Preparation of aryl-substituted butenolides using mucohalic acids
申请人:Blazecka Garth Peter
公开号:US20050131239A1
公开(公告)日:2005-06-16
Methods and materials for preparing 3-aryl-2-buten-4-olides and 2,3-bisaryl-2-buten-4-olides are disclosed. The methods include reacting a mucohalic acid with a reducing agent to give a 2,3-dihalo-2-buten-4-olide, which undergoes at least one Pd catalyzed cross-coupling reaction with an arylboronic acid.
Structure–Odor Correlations in Homologous Series of Mercaptoalkanols
作者:Johannes Polster、Peter Schieberle
DOI:10.1021/acs.jafc.7b01266
日期:2017.5.31
synthesized. Odorthresholds in air and odor qualities were determined, and the results obtained were correlated to the chemical structures. Sensory properties were strongly influenced by steric effects: All homologous series revealed a minimum in odorthresholds between five and seven carbon atoms, and increasing the length of the carbon chain led to an exponential increase in odorthresholds. The olfactory
Conjugate addition of methyl groups of αβ-unsaturated aldehydes: use of Me<sub>5</sub>Cu<sub>3</sub>Li<sub>2</sub>
作者:Derrick L. J. Clive、Vittorio Farina、Pierre Beaulieu
DOI:10.1039/c39810000643
日期:——
Me5Cu3Li2 converts αβ-unsaturated aldehydes efficiently into β-methyl aldehydes and, unlike Me2CuLi, it usually gives a negligible amount of the 1,2-adduct even when a quaternary carbon is generated in the reaction.
New compounds having the formula ##EQU1## wherein R.sub.1 represents a hydrocarbon moiety having from 1 to 7 carbon toms, R.sub.2 is hydrogen, methyl or ethyl, and R.sub.3 is hydrogen, formyl or acetyl. The compounds are useful in the preparation, modification and intensification of a great variety of flavor and perfume compositions.
The invention provides compounds of Formula (I) and pharmaceutically acceptable salts thereof, wherein Ya, Yb, R1, R2, and G are as described in the specification, as well as compositions comprising a compound of formula (I). The compounds are useful as inhibitors of bacterial RNA polymerase and as antibacterial agents.