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。
Synthesis and antibacterial activity of ricinoleic acid glycosides
作者:Ramakrishna Kuppala、Mugunthan Govindarajan、Rushikesh Tambat、Neeraj Patel、Hemraj Nandanwar、Kamlesh K. Bhutani、K. P. Ravindranathan Kartha
DOI:10.1039/c5ra20136e
日期:——
The antibacterial properties of twenty-eight novel ricinoleic acid glycosides synthesized by Koenigs–Knorr glycosylation are reported.
the cleavage of the α‐hydroxyketone derivedfrommethyl oleate. The robustness of these precatalysts was determined by dynamic thermogravimetric analyses (TGA). It has been shown that the stability of these species is mainly governed by the nature of the counter‐anion and some of them were found to be stable until 350–400 °C. The α‐hydroxyketone derivedfrommethyl oleate was cleaved under reactive distillation
作者:A. M. Davletbakova、I. O. Maidanova、N. Z. Baibulatova、V. A. Dokichev、Yu. V. Tomilov、M. S. Yunusov、O. M. Nefedov
DOI:10.1023/a:1012471011407
日期:——
The reaction of ricinolic acid methyl ester with diazomethane in the presence of Co(BF4)(2). 6H(2)O results in selective methylation of the hydroxy group. Methyl (2Z,12R)-12-acetoxy-9-octadecenoate reacts with diazomethane in the presence of Pd(acac)(2), leading to formation of a mixture of cis-cyclopropanated (9S,10S,12R)- and (9R,10R,12R)-diastereoisomers at a ratio of 3:2 (overall yield 73%). Under similar conditions methyl (9Z)-12-oxo-9-octadecenoate gives rise to optically inactive methyl cis-8-[2-(2-oxooctyl)-cyclopropyl]octanoate.
Optical rotatory dispersion and absolute configuration of some long-chain hydroxy acids
作者:Thomas H. Applewhite、Ronald G. Binder、William Gaffield