through quorumsensing (QS), which is an intercellular communication system mediated by the binding of signaling molecules to QS receptors such as LasR. In this study, a range of dihydropyrrolone (DHP) analogues were synthesized via the lactone-lactam conversion of lactone intermediates. The synthesized compounds were tested for their ability to inhibit QS, biofilm formation and bacterial growth of
A newmethod for the catalytic aldol reaction to ketones, using CuF.3PPh3.2EtOH complex as the catalyst and (EtO)3SiF as the additive, is described. The reaction can be applied to a wide range of ketones and trimethylsilyl enolates. On the basis of mechanistic studies, a working hypothesis for the catalytic cycle is proposed, in which the dynamic ligand exchange mediated by copper silicates produces
Studies in decarboxylation. Part 16. Steric inhibition of resonance in a 1,5-sigmatropic reaction
作者:Amal al-Borno、David B. Bigley
DOI:10.1039/p29830001311
日期:——
The rates of gas-phase decarboxylation of some 3-phenyl-substituted but-3-enoic acids are best rationalized in terms of stericinhibition of resonance in the more sterically crowded members.
就空间更拥挤的成员的共振的空间抑制而言,一些3-苯基取代的丁-3-烯酸的气相脱羧速率是最合理的。
Indolinylmethanol catalyzed enantioselective Reformatsky reaction with ketones
作者:Ning Lin、Miao-Miao Chen、Ren-Shi Luo、Yan-Qiu Deng、Gui Lu
DOI:10.1016/j.tetasy.2010.11.004
日期:2010.12
A series of chiral indolinylmethanol ligands have been applied for the first time in the asymmetric Reformatskyreaction of an α-bromoester with ketones. In the presence of NiBr2 and zinc powder, up to 75% yield and 87% ee were obtained for a variety of aromatic and aliphatic ketones. The use of Ni(acac)2 resulted in 96% ee although the corresponding yield was low. This process provided a convenient
Convenient Access to 4,4-Disubstituted 4<i>H</i>-Chromenes. Synthesis of 4-Methyl-4-(4-methoxyphenyl)-benzo[h]-4<i>H</i>-chromene
作者:D. De Keukeleire、W. Saeyens
DOI:10.1080/00397919608003841
日期:1996.12
4-Methyl-4-(4-methoxyphenyl)-benzo[h]-4H-chromene is synthesised by condensation of 4-methoxyacetophenone and ethyl acetate in strong base, followed by coupling with l-naphthol, reduction to the epimeric lactols and elimination of water.