4-(<i>N,N</i>-Dimethylamino)pyridine Hydrochloride as a Recyclable Catalyst for Acylation of Inert Alcohols: Substrate Scope and Reaction Mechanism
作者:Zhihui Liu、Qiaoqiao Ma、Yuxiu Liu、Qingmin Wang
DOI:10.1021/ol4030875
日期:2014.1.3
4-(N,N-Dimethylamino)pyridine hydrochloride (DMAP·HCl), a DMAP salt with the simplest structure, was used as a recyclablecatalyst for the acylation of inert alcohols and phenols under base-free conditions. The reaction mechanism was investigated in detail for the first time; DMAP·HCl and the acylating reagent directly formed N-acyl-4-(N′,N′-dimethylamino)pyridine chloride, which was attacked by the
Practical preparation of challenging amides from non-nucleophilic amines and esters under flow conditions
作者:Johannes L. Vrijdag、Francisca Delgado、Nerea Alonso、Wim M. De Borggraeve、Natalia Pérez-Macias、Jesus Alcázar
DOI:10.1039/c4cc07129h
日期:——
Preparation of amides from low nucleophilic heterocyclic amines is achieved in 2 minutes under mild conditions.
从低亲核杂环胺制备酰胺在温和条件下可以在2分钟内完成。
Alkoxycarbonylation and phenoxycarbonylation reactions catalyzed by a palladium(II) organometallic complex encaged in Y zeolite
作者:Hui Mei、Se Xiao、Tianwu Zhu、Yizhu Lei、Guangxing Li
DOI:10.1007/s11243-014-9818-9
日期:2014.5
Catalytic routes for synthesis of alkyl benzoates by alkoxycarbonylation reactions and aryl benzoates by phenoxycarbonylation reactions of aryl iodides are described using a palladium–1,10-phenanthroline complex encaged in Y zeolite. Moderate to excellent yields (40–99 %) of various benzoates were obtained at low Pd loadings of 0.6 mol%. The catalyst could be effectively removed from the reaction mixture by a simple filtration process and was reused four times with only minor loss of activity. Furthermore, its catalytic activity was further highlighted by a comparison with another two supported Pd catalysts. The protocol has the advantages of easy handing, moderate to excellent yield, and catalyst recyclability.
Tropolonate Salts as Acyl-Transfer Catalysts under Thermal and Photochemical Conditions: Reaction Scope and Mechanistic Insights
作者:Demelza J. M. Lyons、Claire Empel、Domenic P. Pace、An H. Dinh、Binh Khanh Mai、Rene M. Koenigs、Thanh Vinh Nguyen
DOI:10.1021/acscatal.0c03702
日期:2020.11.6
strong nucleophilicity and photochemical activity, can promote the coupling reaction between alcohols and carboxylic acid anhydrides or chlorides to give products under thermal or blue light photochemical conditions. Kinetic studies and density functional theory calculations suggest interesting mechanistic insights for reactions promoted by this acyl-transfer catalytic system.
An Efficient Conversion of Phenolic Esters to Benzothiazoles under Mild and Virtually Neutral Conditions
作者:Asit K. Chakraborti、Santosh Rudrawar、Gurmeet Kaur、Lalima Sharma
DOI:10.1055/s-2004-829089
日期:——
Phenolic esters are efficiently converted to 2-substituted benzothiazoles in a one-pot reaction by treatment with 2-aminothiophenol in the presence of a catalytic amount of K2CO3 in N-methyl-2-pyrrolidone (NMP) at 100 °C.
在 100 °C 的 N-甲基-2-吡咯烷酮(NMP)中,在一定量的 K2CO3 催化下,通过与 2-氨基苯硫酚的一锅反应,酚酯可高效地转化为 2-取代的苯并噻唑。