Second Generation Protocol for Multicomponent Coupling Reactions of Aldehydes, Amides and Dienophiles
作者:Stefan Klaus、Sandra Hübner、Helfried Neumann、Dirk Strübing、Axel Jacobi von Wangelin、Dirk Gördes、Matthias Beller
DOI:10.1002/adsc.200404056
日期:2004.7
three-component coupling reaction of aldehydes, amides and dienophiles (AAD reaction) has been developed. Compared to known protocols for this type of reaction, the use of aromatic solvents in the presence of dehydrating reagents allows an efficient synthesis of previously not accessible products. Condensation of ubiquitous available aldehydes and amides and subsequent Diels–Alder reactions with dienophiles
Synthesis of 1,3,5-trioxanes: A new, simple method using a bentonitic earth as catalyst.
作者:R. Camarena、A.C. Cano、F. Delgado、N. Zúñiga、C. Alvarez、O. García
DOI:10.1016/s0040-4039(00)91813-6
日期:1993.10
A simple method for synthesizing aliphatic as well as aromatic 1,3,5-trioxanes using as catalyst a bentonitic earth is reported. The yields ranged from good to excellent.
据报道,使用膨润土作为催化剂合成脂肪族和芳香族1,3,5-三恶烷的简单方法。产量从良到良。
Synthesis and Sensorial Properties of 2-Alkylalk-2-enals and 3-(Acetylthio)-2-alkyl Alkanals
characterized in terms of GC, MS, and NMR data. The sensory properties of the odorants, such as odor quality and odor detection threshold value, were determined with a trained panel. Structure-activityrelationships are discussed, suggesting that the 1,3-oxygen-sulfur functionality, required for the "olfactophore" of tropical/vegetable notes, can further be extended to the acetylthio derivatives.
RuCl3 catalyses aldol condensations of aldehydes and ketones
作者:Nasser Iranpoor、Foad Kazemi
DOI:10.1016/s0040-4020(98)00575-4
日期:1998.8
Anhydrous RuCl3 catalyses the efficient cross aldolcondensations of different ketones with various aromaticaldehydes in sealed tube under solvent free conditions without the occurrence of any self condensations. Regioselective self condensation reaction of some ketones and aldehydes are also described. The catalytic effect of Ru(III) is shown by performing similar reactions under thermal conditions
Production of unsaturated aldehydes by the aldol condensation of straight chain aldehydes, e.g. butyraldehyde, by contacting the aldehyde in the vapour phase with a particulate catalyst comprising at least one basic alkali metal compound supported on an inert substrate at a temperature above 175° C.