A One-Pot, fast, and efficient amidation of carboxylic acids, α-amino acids and sulfonic acids using pph3/n-chlorobenzotriazole system
摘要:
Triphenylphosphine (PPh3)/N-chlorobenzotriazole (NCBT), and amine (primary and secondary aliphatic amines and also substituted anilines) in CH2Cl2 efficiently converted carboxylic acids, -amino acids, and sulfonic acids to the corresponding amides and sulfonamides at room temperature. Good to excellent yields, inexpensive, and fast reaction conditions are the important features of this procedure.
TiCl4-Mediated Direct N-Alkylation of Sulfonamides with Inactive Ethers
作者:Wei Zeng、Jiayan Chen、Ling Dang、Qiang Li、Yong Ye、Shaomin Fu
DOI:10.1055/s-0031-1290332
日期:2012.3
A TiCl4-mediated intermolecular or intramolecular direct N-alkylationreaction of sulfonamides with inactive ethers as alkylating agents was successfully achieved. This method provides a novel approach towards N-alkyl sulfonamides from inactive ethers via an easy workup procedure. N-alkylation - Lewis acid - N-alkyl sulfonamide - dialkyl ether - titanium tetrachloride
Experimental and Computational Studies on Cp*<sup>Cy</sup>Rh(III)/KOPiv-Catalyzed Intramolecular Dehydrogenative Cross-Couplings for Building Eight-Membered Sultam/Lactam Frameworks
作者:Liping Li、Hui Gao、Ming Sun、Zhi Zhou、Wei Yi
DOI:10.1021/acs.orglett.0c01823
日期:2020.7.17
is an unusual Cp*CyRh(III)-catalyzed intramolecular site-specific aryl C–H annulation, a highly chemoselective protocol providing direct access to eight-membered sultams/lactams with broad substrate/functional group tolerance. Experimental and computational studies reveal that such a transformation involves a unique PivOH-assisted aryl C–H activation/alkene insertion/β-H elimination/hydrogen-transfer
Photoinduced C(sp<sup>3</sup>)–H chlorination of amides with tetrabutyl ammonium chloride
作者:Yanshuo Zhu、Wei Yu
DOI:10.1039/d1ob02081a
日期:——
developed for the site-selective C(sp3)–H chlorination of amides with tetrabutyl ammonium chloride as the chlorinating agent. The reaction features a tandem sequence that involves a (diacetoxyiodo)benzene-mediated and chloride anion-involved N–H chlorination followed by photoinitiated chlorineatom transfer. A wide variety of carboxamides and sulfonamides were chlorinated at the δ-position by using this method
Mass spectrometry study of N-alkylbenzenesulfonamides with potential antagonist activity to potassium channels
作者:Carina C. Martins、Carlos A. Zanutto Bassetto、Jandyson M. Santos、Marcos N. Eberlin、Alvicler Magalhães、Wamberto Varanda、Eduardo R. Perez Gonzalez
DOI:10.1007/s00726-015-2099-6
日期:2016.2
several N-alkylbenzenesulfonamides structurally related to sulfanilic acid. The compounds were synthesized using a modified Schotten–Baumann reaction coupled with Meisenheimer arylation. Sequential mass spectrometry by negative mode electrospray ionization (ESI(−)-MS/MS) showed the formation of sulfoxylate anion (m/z 65) observed in the mass spectrum of p-chloro-N-alkylbenzenesulfonamides. Investigation
在本文中,我们报告了与磺胺酸结构相关的几种N-烷基苯磺酰胺的合成和质谱研究。这些化合物是使用改良的Schotten-Baumann反应与Meisenheimer芳基化反应合成的。通过负模式电喷雾电离(ESI(-)-MS / MS)进行的连续质谱分析表明,在对氯-N-烷基苯磺酰胺的质谱图中观察到形成了亚硫酸根阴离子(m / z 65)。通过电子电离质谱(EI-MS)对p-(N-烷基)内酰胺磺酰胺,导致提出了相应的断裂途径的提议。这些化合物显示出中性亚氨基亚砜基二氧化分子(M-79)的损失,并在m / z 344和377处观察到离子的形成。这些离子是通过ESI(+)-MS / MS分析上的重排而形成的。一些分子显示出对Kv3.1电压门控钾通道的拮抗活性。
Evidence for an isocyanate formation in the alkaline hydrolysis of N<sup>1</sup>-alkyl derivatives of chlorpropamide, inhibitors of aldehyde dehydrogenase
作者:M. Bergon、A. Vigroux、P. Tisnès
DOI:10.1039/c39930000946
日期:——
Trapping of a propyl isocyanate intermediate and entropies of activation data are consistent with an elimination–addition mechanism AxhDH+ DN(E1cB) for the hydrolysis of 1-alkyl-1-[(4-chlorophenyl)sulfonyl]-3-n-propylurea, the N1-alkyl derivatives of chlorpropamide, inhibitors of aldehyde dehydrogenase.