Application of Poly(Vinylbenzyltrimethylammonium Tribromide) Resin as an Efficient Polymeric Catalyst in the Acetalization and Diacetylation of Benzaldehydes
作者:Zubiao Zheng、Bingbing Han、Junjun Hu、Xianwei Li
DOI:10.2174/1570178617999200718002933
日期:2021.3
applications of a new supported tribromide reagent (poly(vinylbenzyltrimethylammonium tribromide) resin) were reported. This supported tribromide resin was used as a catalyst in the acetalization and diacetylation of benzaldehydes under mild conditions with high efficiency. The effects of solvents, and amount of the supported tribromide resin on the reactions were investigated. Under the optimal conditions
Visible-Light-Induced Acetalization of Aldehydes with Alcohols
作者:Hong Yi、Linbin Niu、Shengchun Wang、Tianyi Liu、Atul K. Singh、Aiwen Lei
DOI:10.1021/acs.orglett.6b03403
日期:2017.1.6
have achieved a simple and general method for acetalization of aldehydes by means of a photochemical reaction under low-energy visible light irradiation. A broad range of aromatic, heteroaromatic, and aliphatic aldehydes have been protected under neutral conditions in good to excellent yields using a catalytic amount of Eosin Y as the photocatalyst. Our visible light mediated acetalization strategies are
Catalytic application of sulfamic acid-functionalized magnetic Fe<sub>3</sub>O<sub>4</sub> nanoparticles (SA-MNPs) for protection of aromatic carbonyl compounds and alcohols: experimental and theoretical studies
作者:Sepideh Khaef、Mohammad Ali Zolfigol、Avat Arman Taherpour、Meysam Yarie
DOI:10.1039/d0ra09087e
日期:——
Protection techniques of functional groups within the structure of organic compounds are important synthetic methods against unwanted attacks from various reagents during synthetic sequences. Acetal and thioacetal groups are well known as protective functional groups in organic reactions. In this study, acetalization of carbonyl compounds with diols and dithiols and methoxymethylation of alcohols with
有机化合物结构内官能团的保护技术是重要的合成方法,可防止合成过程中各种试剂的不必要的攻击。众所周知,缩醛和硫缩醛基团是有机反应中的保护性官能团。在这项研究中,使用氨基磺酸功能化磁性Fe 3 O 4纳米粒子(SA-MNPs)作为非均相固体酸催化剂,进行了羰基化合物与二醇和二硫醇的缩醛化以及醇与甲醛二甲基缩醛(FDMA)的甲氧基甲基化。产品通过 FT-IR 和 NMR 光谱进行表征。一些产品的结构和电子特性是通过量子力学(QM)方法计算的。根据计算结果获得的立体化学和电子性质,我们认为超共轭在2-苯基-1,3-二氧戊环衍生物的结构性质以及2-苯基-1,3-二氧戊环衍生物的π电子之间的电子转移中起着关键作用。具有S原子3d轨道的芳香环影响2-苯基-1,3-二噻烷衍生物的结构。
Ru-Catalyzed Deoxygenative Regioselective C8–H Arylation of Quinoline <i>N</i>-Oxides
Regioselective C-H functionalization on quinolines is of high interest to lead to value-added products. Herein, we describe the development of Ru-catalyzed deoxygenative regioselective C8 arylation of quinoline N-oxides with arylboronic esters. Mechanistic studies revealed that it proceeds in a tandem process of arylation and then deoxygenation, wherein both steps were found to be catalytic with the
Copper-Catalyzed Trifluoromethylation of Aryl Iodides with Potassium (Trifluoromethyl)trimethoxyborate
作者:Thomas Knauber、Fatih Arikan、Gerd-Volker Röschenthaler、Lukas J. Gooßen
DOI:10.1002/chem.201002749
日期:2011.2.25
Potassium (trifluoromethyl)trimethoxyborate is introduced as a new source of CF3 nucleophiles in copper‐catalyzed trifluoromethylation reactions. The crystalline salt is stable on storage, easy to handle, and can be obtained in near‐quantitative yields simply by mixing B(OMe)3, CF3SiMe3, and KF. The trifluoromethylation reagent allows the conversion of various aryl iodides into the corresponding benzotrifluorides
(三氟甲基)三甲氧基硼酸钾是在铜催化的三氟甲基化反应中作为CF 3亲核试剂的新来源而引入的。结晶盐储存稳定,易于处理,只需将B(OMe)3,CF 3 SiMe 3和KF混合即可以接近定量的产率获得。三氟甲基化试剂可在催化量的Cu I / 1,10-菲咯啉络合物存在下,在温和,无碱的条件下,将各种芳基碘化物高产率地转化为相应的苯并三氟化物。