Efficienttransamidation of unactivated carboxamides, phthalimides, formamides and thioamides with amines undersolvent-freeconditions using H-β-zeolite as a green and recyclable heterogeneous catalyst is described. Easy work up, high purity of the products, recyclability and environmentally-friendly nature of the catalyst are the attractive features of the present methodology. This is the first report
adopt structures that are highly twisted from planar conformations. Their orientations were tuned by the steric and/or electronic interactions of the substituents at their 2-, 4-, and 5-positions. The 5-aminothiazoles exhibited a range of fluorescent emissions, from blue to orange. Although the absorption spectra were independent of the polarity of the solvent, fluorescent emissions were influenced
An efficient iodine-mediated multipathway coupled domino reaction has been developed for the synthesis of thiobenzamides from benzylamines, benzylamines/aldehydes, and N-alkyl benzylamines under the same reaction conditions. This approach combines two consecutive domino processes in one pot using iodine as the oxidant.
MOREAU R. C.; LOISEAU P.; BERNARD J.; SEBASTEIN F.; LEROY R., EUR. J. MED. CHEM.-CHIM. THER., 1979, 14, NO 4, 317-320
作者:MOREAU R. C.、 LOISEAU P.、 BERNARD J.、 SEBASTEIN F.、 LEROY R.
DOI:——
日期:——
Intramolecular dehydrogenative C–S bond coupling of thioamides to form 1,3-benzothiazines under metal-free conditions
作者:Li-Rong Wen、Cheng-Cheng Zhou、Ming-Zhe Zhu、Shu-Guang Xie、Wei-Si Guo、Ming Li
DOI:10.1039/c9ob00237e
日期:——
coupling reaction of thioamides has been developed to provide 1,3-benzothiazine derivatives in good yields. The reaction proceeds smoothly to reach completion at room temperature within 1 min under metal-free conditions. This protocol provides a mild and efficient strategy for the synthesis of six-membered N,S-containing heterocycles. Preliminary mechanistic studies indicate that a spirocyclic intermediate