KO<sup>t</sup>Bu mediated efficient approach for the synthesis of fused heterocycles via intramolecular O-/N-arylations
作者:Raju Singha、Atiur Ahmed、Yasin Nuree、Munmun Ghosh、Jayanta K. Ray
DOI:10.1039/c5ra07532g
日期:——
KOtBu mediated an efficient methodology has been developed for the synthesis of 6H-benzo[c]chromenes, 6H-benzo[c]chromen-6-ones, carbazoles, dibenzofurans and dibenzooxepins.
Visible light mediated synthesis of 6<i>H</i>-benzo[<i>c</i>]chromenes: transition-metal-free intramolecular direct C–H arylation
作者:Micaela D. Heredia、Marcelo Puiatti、Roberto A. Rossi、María E. Budén
DOI:10.1039/d1ob01673c
日期:——
A synthetic approach towards the 6H-benzo[c]chromene ring under visible light and transition-metal-free conditions has been developed. Benzochromenes are synthesized from the corresponding (2-halobenzyl) phenyl ethers or (2-halophenyl) benzyl ethers using KOtBu in dimethyl sulfoxide (DMSO) at room temperature (rt) and blue light-emitting diodes (LEDs) as the light source. This methodology replaces
已经开发了一种在可见光和无过渡金属条件下合成 6 H-苯并[ c ]色烯环的方法。苯并色烯是由相应的 (2-卤代苄基) 苯基醚或 (2-卤代苯基) 苄基醚在室温 (rt) 下使用二甲基亚砜 (DMSO) 中的 KO t Bu 和蓝色发光二极管 (LED) 作为光源合成的. 这种方法取代了配体或添加剂、高温和有毒溶剂的使用。光刺激反应对不同的官能团和 5 H-二苯并[ c , f]色烯也被有效地获得。发现了由二甲基阴离子和(2-卤代苄基)苯基醚形成的电子供体-受体复合物,它诱导 ET 作为光环化反应的第一步。此外,为了解释该反应的区域化学结果,使用 DFT 方法进行了理论分析。
Palladium-catalyzed and KO Bu-promoted Caryl–Oalcoholic coupling: an efficient one-pot synthesis of oxygen containing fused rings
作者:Atiur Ahmed、Shubhendu Dhara、Jayanta K. Ray
DOI:10.1016/j.tetlet.2013.01.062
日期:2013.3
An efficient one-pot synthetic method has been developed for the synthesis of oxygen containing fused rings from 2'-bromo-biaryl-2-carbaldehyde via tandem reduction followed by palladium-catalyzed and (KOBu)-Bu-t-promoted C-aryl-O-alcoholic coupling. (c) 2013 Elsevier Ltd. All rights reserved.
Palladium‐Catalyzed Intramolecular Decarboxylative Coupling of Arene Carboxylic Acids/Esters with Aryl Bromides
Give me a ring? An efficient approach has been developed for the intramolecular decarboxylative coupling of arene carboxylicacids/esters with aryl bromides catalyzed by palladium (see scheme). From a synthetic viewpoint, this method is highly attractive because the catalyst loading is low, the optimized reaction conditions are mild, and the substrate scope is broad.