发现层状双氢氧化物负载的二异丙基酰胺(LDH-DA)催化剂是在液相条件下用于醇醛,Knoevenagel,Henry,Michael,酯交换和环氧化反应的有效且选择性的固体碱。LDH-DA是通过二异丙基氨基锂与LDH-NO 3(合成后)和煅烧的LDH-NO 3相互作用而合成的。通过使用各种仪器技术,如FT-IR,TGA和DTA,粉末XRD,固态27 Al MAS NMR光谱,SEM和XPS(ESCA ),可以很好地表征LDH-DA(Mg / Al,3/1)及其前体)。
Vanadium(IV) acetylacetonate catalyzed stereoselective synthesis of β-enaminoesters and β-enaminones
作者:Rajibul A. Laskar、Naznin A. Begum、Mohammad Hedayetullah Mir、Shahzad Ali、Abu T. Khan
DOI:10.1016/j.tetlet.2012.11.051
日期:2013.1
and stereoselective procedure has been described for the synthesis of a series of β-enaminoesters and β-enaminones by vanadium(IV) acetylacetonate [VO(acac)2] catalyzed reaction of β-ketoesters and 1,3-diketones with both aliphatic and aromatic amines. X-ray crystallographicstudies of some representative compounds corroborate two types of structural geometry formed by inter-molecular as well as intra-molecular
A Mild and Regioselective Method for α-Bromination of β-Keto Esters and 1,3-Diketones Using Bromodimethylsulfonium Bromide (BDMS)
作者:Abu T. Khan、Md Ashif Ali、Papori Goswami、Lokman H. Choudhury
DOI:10.1021/jo061501r
日期:2006.11.1
Bromodimethylsulfonium bromide has been found to be an effective and regioselective reagent for α-monobromination of β-ketoesters and 1,3-diketones. A wide variety of β-ketoesters and 1,3-diketones undergo chemoselective α-monobromination with excellent yields at 0−5 °C or room temperature. The notable advantages of this protocol are no need of chromatographic separation, use of less hazardous reagent
Synthesis of Fatty Acetoacetates Under Microwave Irradiation Catalysed by Sulfamic Acid in a Solvent-Free System
作者:Andressa C. H. Weber、Thaís C. Batista、Bruno Gonçalves、Carolina R. L. Hack、Larissa M. Porciuncula、Tamara G. M. Treptow、Caroline Da R. Montes D'Oca、Dennis Russowsky、Marcelo G. Montes D'Oca
DOI:10.1007/s11746-016-2879-5
日期:2016.10
The 1,3‐dicarbonyl compounds are important building blocks to obtain products with various biologicalactivities and technological applications. In this work, we used a simple transesterification method to develop fatty acetoacetates in a solvent‐free medium using a green catalyst, sulfamic acid (NH2SO3H), under microwave irradiation. The experimental results demonstrate good yields in a short reaction
1,3-二羰基化合物是获得具有各种生物活性和技术应用产品的重要组成部分。在这项工作中,我们使用一种简单的酯交换方法,在无溶剂的介质中,使用绿色催化剂氨基磺酸(NH 2 SO 3 H),在微波辐射下开发了乙酰乙酸脂肪酯。实验结果表明,在短的反应时间(13分钟)内具有良好的收率,这使该方法成为从多种饱和,不饱和和多不饱和长链脂肪醇和蓖麻油酸衍生物合成脂肪族乙酰乙酸酯的有效方法。进行了催化剂再循环的实验,未观察到氨基磺酸的催化活性降低。
3-Nitrobenzeneboronic Acid as an Efficient and Environmentally Benign Catalyst for the Selective Transesterification of β-Keto Esters
作者:R. Tale、A. Sagar、H. Santan、R. Adude
DOI:10.1055/s-2006-932454
日期:——
An efficient and high-yielding procedure for the selective transesterification of various β-ketoesters using 3-nitrobenzeneboronic acid as a catalyst in an environmentally acceptable process is described.
Synthesis and structural study of new highly lipophilic 1,4-dihydropyridines
作者:Margarita Suárez、Merly de Armas、Oney Ramírez、Amaury Alvarez、Roberto Martínez-Alvarez、Dolores Molero、Carlos Seoane、Ramón Liz、Hector Novoa de Armas、Norbert M. Blaton、Oswald M. Peeters、Nazario Martín
DOI:10.1039/b506018d
日期:——
A new series of 1,4-dihydropyridines (1,4-DHPs) endowed with ester groups bearing long and functionalised alkoxy chains at the C3 and C5 positions of the nitrogen ring have been prepared from the corresponding β-keto esters which were in turn prepared by a lipase catalysed transesterification reaction. The structural study has been carried out by X-ray crystallography and theoretical calculations at