Reinvestigation of ortho-amidoacetophenones' cyclization mediated by trimethylsilyl trifluoromethanesulfonate. The Lewis-acid-assisted and Brønsted-acid-catalyzed reaction
作者:Yi-Ru Chen、Yu Cheng Cho、Tzenge-Lien Shih
DOI:10.1016/j.tet.2016.02.068
日期:2016.4
Reinvestigation the synthesis of quinolones from ortho-amidoacetophenones by trimethylsilyl trifluoromethanesulfonate (TMSOTf) mediated reaction is reported. In addition to receiving the expected quinolones, an unexpected intermolecular self-condensation adduct was also isolated. The detailed mechanism of its formation is discussed.
Weakly Coordinating, Ketone-Directed (η<sup>5</sup>
-Pentamethylcyclopentadienyl)cobalt(III)- and (η<sup>5</sup>
-Pentamethylcyclopentadienyl)rhodium(III)-Catalyzed C−H Amidation of Arenes: A Route to Acridone Alkaloids
作者:Sourav Sekhar Bera、Md Raja Sk、Modhu Sudan Maji
DOI:10.1002/chem.201805376
日期:2019.2.1
monoamidation of aromatic ketones, chalcone, carbazole, and benzophenones was achieved by employing high‐valent cobalt and rhodium catalysis to access numerous biologically important molecular building blocks. This amidation proceeded smoothly with a variety of ketones and several amidating partners. The application of the products in the synthesis of various heterocycles, including acridones, indoles, quinoline
series of C-3 position perfluoroalkylated 4-quinolones were obtained smoothly via radical pathway in the presence of RfSO2Na and (NH4)2S2O8. The protocol features broad substrates scope, high regioselectivity, transition metal-free, and easily available fluorinating reagents, exhibiting potential application value for obtaining bioactive compounds.
在R f SO 2 Na 和(NH 4 ) 2 S 2 O 8存在下,通过自由基途径顺利获得了一系列C-3位全氟烷基化4-喹诺酮类化合物。该方案具有底物范围广、区域选择性高、不含过渡金属、易于获得的氟化试剂等特点,在获得生物活性化合物方面具有潜在的应用价值。
Electrochemical cyclization of o-trichloroacetylanilides: Preparation of 4H-3,1-benzoxazin-4-ones and 3,3-dichloroquinolin-4-ones.
作者:Pedro Molina、Carlota Conesa、María D. Velasco
DOI:10.1016/s0040-4039(00)60087-4
日期:1993.1
The electrochemical reduction of several o-trichloromethylanilides and their imidoyl chloride derivatives on mercury pool in acetonitrile, yields 4H-3,1-benzoxazin-4-ones and 3,3-dichloroquinolin-4-ones respectively.