Increasing Fluorous Partition Coefficients by Solvent Tuning
作者:Marvin S. Yu、Dennis P. Curran、Tadamichi Nagashima
DOI:10.1021/ol051170p
日期:2005.8.1
problem in liquid-liquidseparationsusing perfluoroalkanes as the fluorous phase. Solvent tuning of both the nonfluorous and the fluorous phase dramatically enhances the partitioning of light or polar fluorous molecules into the fluorous liquid phase, while minimally effecting partition coefficients of nonfluorous molecules. These findings suggest an expanded scope for liquid-based separations in fluorous
An efficient and rapid procedure for microwave-assisted aminocarbonylation of aryl bromides and iodides at low CO pressure, using (PPh3)2PdCl2 or Pd(OAc)2 as catalysts is reported. Different reaction conditions have been tested in order to carry out the reaction even on less nucleophilic anilines such as 2-chloro-4-nitroaniline, allowing a rapid access (in 20-30 min) to several diverse arylamides in good yields.
Latent Brønsted Base Solvent-Assisted Amide Formation from Amines and Acid Chlorides
作者:Rikuto Otsuka、Kazuo Maruhashi、Tomohiko Ohwada
DOI:10.1055/s-0037-1609342
日期:2018.5
Weakly basic amines, including even neutral amines such as nitroaniline and aminocarboxylic acids, react with acid chlorides very efficiently in N,N-dimethylacetamide (DMAC), without addition of a base, to give the corresponding amides in high yields. The role of DMAC and related solvents as latent Brønsted bases was studied in these amidation reactions. Less basic amines, such as aromatic amines, reacted
catalyzed N-alkylation of benzamides and sulfonamides with alcohols via borrowing hydrogen catalysis is illustrated. Various primary alcohols, including benzyl, heteroaryl, and aliphatic alcohols, were alkylated in good to excellent yields. To shed light on the mechanistic details, several control studies and deuterium labeling experiments were performed. Mechanisticstudies underpin that the reaction is going
说明了通过借氢催化有效的钌掺杂水滑石催化苯甲酰胺和磺酰胺与醇的 N-烷基化。各种伯醇,包括苄基醇、杂芳基醇和脂肪醇,都以良好的收率进行了烷基化。为了阐明机械细节,进行了几项对照研究和氘标记实验。机理研究表明,该反应是通过借氢途径而不是 S N 1 型机理进行的。该反应可以很容易地扩大规模,而不会对产率产生任何不利影响。该催化剂还能够直接由2-氨基苯甲酰胺和醇合成喹唑啉酮。成功的可回收性和高反应性突出了催化剂的实际适用性。
N‐Heterocyclic Olefin‐Phosphines Based Cationic Ruthenium Complexes as Pre‐Catalysts for Dual C−H Bond Functionalizations
olefin‐phosphines and the corresponding ruthenium complexes were synthesized and structurally characterized. One of the cationic complexes [(BzIM)(NHOP)Ru(p‐cymene)Cl2]I was employed as a catalyst in N‐benzylbenzamides/alkyne coupling reactions. With this catalytic protocol a variety of substituted isoquinolones were synthesized through ortho‐selective double C‐H bond functionalization involving oxidative