<i>N</i>-Acyl DBN Tetraphenylborate Salts as <i>N</i>-Acylating Agents
作者:James E. Taylor、Matthew D. Jones、Jonathan M. J. Williams、Steven D. Bull
DOI:10.1021/jo202647f
日期:2012.3.16
synthesized from 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) and the corresponding acyl chloride in the presence of sodium tetraphenylborate. The salts have been shown to be effective N-acylating agents, reacting with primary amines, secondary amines, and sulfonamides to form the corresponding N-acylated products in good yields. The DBN hydrotetraphenylborate byproduct can be conveniently removed by filtration
Catalytic activity of magnetic Fe3O4@Diatomite earth and acetic acid for the N-acylation of sulfonamides
作者:Mohammad Hadi Ghasemi、Elaheh Kowsari、Seyed Kiumars Hosseini
DOI:10.1016/j.tetlet.2015.12.044
日期:2016.1
The Brønsted and Lewis acidic promoted N-acylation of sulfonamides with acetic anhydride or benzoyl chloride has been achieved using glacialacetic acid and magnetic Fe3O4@Diatomite earth. Use of acetic acid as solvent omits the need for organic bases and permits the isolation of products by filtration and precipitation. Additionally, the magnetic composite Fe3O4@Diatomite acts as a conjugate proton
使用冰醋酸和磁性Fe 3 O 4 @硅藻土可以实现磺酰胺与乙酸酐或苯甲酰氯的Brønsted和Lewis酸性促进的N-酰化反应。使用乙酸作为溶剂不需要有机碱,并允许通过过滤和沉淀分离产物。此外,磁性复合材料Fe 3 O 4硅藻土还可以作为共轭质子超强酸,实现磺酰胺化合物的酰化。
Alkene <i>Syn</i>- and <i>Anti</i>-Oxyamination with Malonoyl Peroxides
作者:Jonathan M. Curle、Marina C. Perieteanu、Philip G. Humphreys、Alan R. Kennedy、Nicholas C. O. Tomkinson
DOI:10.1021/acs.orglett.0c00253
日期:2020.2.21
Malonoyl peroxide 6 is an effective reagent for the syn- or anti-oxyamination of alkenes. Reaction of 6 and an alkene in the presence of O-tert-butyl-N-tosylcarbamate (R3 = CO2tBu) leads to the anti-oxyaminated product in up to 99% yield. Use of O-methyl-N-tosyl carbamate (R3 = CO2Me) as the nitrogen nucleophile followed by treatment of the product with trifluoroacetic acid leads to the syn-oxyaminated
Facile Synthesis of<i>N</i>‐Acylsulfonamide in the Presence of Silica Chloride (SiO<sub>2</sub>‐Cl) both under Heterogeneous and Solvent‐Free Conditions
Abstract Sulfonamides were converted to the corresponding N‐acyl sulfonamides with carboxylic acid chlorides and anhydrides in the presence of silica chloride. All reactions were performed in bothheterogeneous and solvent‐freeconditions. This method provides the N‐acyl sulfonamides products in good to high yield and purity.
Synthesis, in vitro antibacterial and carbonic anhydrase II inhibitory activities of N-acylsulfonamides using silica sulfuric acid as an efficient catalyst under both solvent-free and heterogeneous conditions
Silicasulfuricacid catalyzes efficiently the reaction of sulfonamides with both carboxylic acid anhydrides and chlorides undersolvent-free and heterogeneous conditions. All the reactions were done at room temperature and the N-acylsulfonamides were obtained with high yields and purity via an easy work-up procedure. This method is attractive and is in a close agreement with green chemistry. These