A practical synthesis of 2,3-dihydro-1,5-benzothiazepines
作者:Domenico C. M. Albanese、Nicoletta Gaggero、Meng Fei
DOI:10.1039/c7gc02097j
日期:——
2,3-Dihydro-1,5-benzothiazepines have been obtained through a domino process involving a Michael addition of 2-aminothiophenols to chalcones, followed by in situ cyclization. Up to 98% chemical yields have been obtained at room temperature under essentially neutral conditions by using hexafluoro-2-propanol as an efficient medium.
Organocatalytic [10+4] cycloadditions for the synthesis of functionalised benzo[<i>a</i>]azulenes
作者:Maxime Giardinetti、Nicolaj Inunnguaq Jessen、Mette Louise Christensen、Karl Anker Jørgensen
DOI:10.1039/c8cc08551j
日期:——
A direct and mild strategy for the synthesis of benzo[a]azulenes based on an organocatalytic [10+4] cycloaddition reaction is described. The strategy enables a diversity-oriented approach for the synthesis of various poly-functionalised azulenes from easily accessible starting materials.
描述了基于有机催化的[10 + 4]环加成反应合成苯并[ a ] azulenes的直接和温和的策略。该策略为从易于获得的起始原料合成各种多官能化的天青石提供了一种面向多样性的方法。
BF<sub>3</sub>
⋅OEt<sub>2</sub>
-Promoted Annulation for Substituted 2-Arylpyridines as Potent UV Filters and Antibacterial Agents
作者:Sabera Sultana、Shizuka Mei Bautista Maezono、Muhammad Saeed Akhtar、Jae-Jin Shim、Young-Jung Wee、Sung Hong Kim、Yong Rok Lee
DOI:10.1002/adsc.201701137
日期:2018.2.15
efficient BF3⋅OEt2 mediated methodology for the construction of diverse 2‐phenylpyridines bearing benzophenone moieties from readily available 3‐formylchromones and phenylacetylenes in wet acetonitrile was developed. The nitrogen source for the pyridine construction was derived from acetonitrile. This one‐potprotocol proceeds via [3+2+1] annulation through cascade nucleophilic addition, hydrolysis, Michael‐type
A Brønsted acid controlled Diels-Alder reaction of 3-vinylchromones with arynes has been developed. By employing different kinds and amounts of acid, 9-aryl-9H-xanthen-9-ols or ortho-hydroxybenzophenones could be controllably furnished in good yields in an atom- and step-economic manner.
Efficient one pot and chemoselective synthesis of functionalized 3-bromo-4,5-dihydroisoxazole derivatives via 1,3-dipolar cycloaddition reactions of nitrile oxides
A novel, metal-free and chemoselective approach for the synthesis of 4,5-dihydroisoxazole derivatives has been developed by the reaction of readily accessible starting materials including 4-oxo-4H-chromene-3-carbaldehyde, 1-phenyl-2-(1,1,1-triphenyl-λ5-phosphanylidene)ethan-1-one and dibromoformaldoxime under mild conditions in the presence of KHCO3.