A simple and efficient method for the synthesis of Erlenmeyer azlactones
作者:Philip A. Conway、Kevin Devine、Francesca Paradisi
DOI:10.1016/j.tet.2009.02.011
日期:2009.4
novel and efficient method for synthesising Erlenmeyerazlactones under mild and rapid conditions. The reaction is performed by reacting 2-phenyl-5-oxazolone with an aldehyde in dichloromethane using alumina as a catalyst. The materials react instantly at room temperature, negating the need for high temperatures and long reaction times. We have successfully used this method for both aliphatic, aromatic
MgO/Al2O3 catalyzes the synthesis of azlactone derivatives from condensation reaction of aldehydes (or ketones) with hippuric acid and acetic anhydride as a dehydrating agent under microwave irradiation. The low toxicity, low cost, ease of handling, and high activity of MgO/Al2O3 make this procedure particularly attractive. Also, this catalyst can be easily recovered by decant and can be reused for
MgO / Al 2 O 3催化醛(或酮)与作为脱水剂的马尿酸和乙酸酐的缩合反应在微波辐射下的合成内酯衍生物。MgO / Al 2 O 3的低毒性,低成本,易于处理和高活性使该程序特别有吸引力。同样,该催化剂可以容易地通过倾析回收,并且可以连续五次重复用于该缩合反应,而不会显着降低其催化活性。
Microwave-assisted efficient synthesis of azlactones using zeolite NaY as a reusable heterogeneous catalyst
作者:Mohammad Ali Bodaghifard、Hassan Moghanian、Akbar Mobinikhaledi、Fatemeh Esmaeilzadeh
DOI:10.1080/15533174.2016.1212242
日期:2017.6.3
azlactones in the presence of zeolite NaY has been reported. This heterogeneouscatalyst was used for efficient synthesis of azlactone derivatives with Ac2O as a condensing agent under microwave irradiation and solvent-free conditions. The present method offers the advantages of good yields, short reaction time, simple work-up, and catalystreusability, which makes this method mild and eco-friendly.
Synthesis and Herbicidal Activity of 4-Benzylidene-2-phenyl oxazol-5(4H)-one Derivatives using L-Proline as Catalyst
作者:S. Bhandari、V. Kasana
DOI:10.14233/ajchem.2018.21251
日期:——
A simple, efficient and environmentally benign method for the synthesis of 4-benzylidene-2-phenyl oxazol-5(4H)-one derivatives by the reaction of aromatic aldehydes and hippuric acid using acetic anhydride as dehydrating agent and L-proline as catalyst has been developed. L-proline acts as a highly efficient organocatalyst. It is thermally stable and can withstand harsh reaction conditions besides being easily available and environmentally non-hazardous. The structures of synthesized compounds were evaluated by FT-IR and 1H-NMR spectroscopy. The present method is superior to the existing methods as it takes less reaction time, involves easy work up and affords products in excellent yield. The preliminary bioassay of synthesized compounds indicated that most of the compounds exhibited good seed germination inhibition activity against radish seed (Raphanus sativus).
Bismuth (III) Acetate: A New Catalyst for Preparation of Azlactones via the Erlenmeyer Synthesis
作者:Keith A. Monk、Dusan Sarapa、Ram S. Mohan
DOI:10.1080/00397910008086926
日期:2000.9
Abstract Bismuth(III) acetate catalyzes the synthesis of azlactones from aromatic aldehydes in moderate to good yields via the Erlenmeyersynthesis. The relatively low toxicity and low cost of bismuth(III) acetate make this procedure particularly attractive.