Catalyst- and Supporting-Electrolyte-Free Electrosynthesis of Benzothiazoles and Thiazolopyridines in Continuous Flow
作者:Ana A. Folgueiras-Amador、Xiang-Yang Qian、Hai-Chao Xu、Thomas Wirth
DOI:10.1002/chem.201705016
日期:2018.1.9
N‐arylthioamides have been converted to the corresponding benzothiazoles in good to excellent yields and with high current efficiencies. This transformation is achieved using only electricity and laboratory grade solvent, avoiding degassing or the use of inert atmosphere. This work highlights three advantages of electrochemistry in flow, which is (i) a supporting electrolyte‐free reaction, (ii) an easy scale‐up
Use of Molecular Oxygen as a Reoxidant in the Synthesis of 2-Substituted Benzothiazoles via Palladium-Catalyzed CH Functionalization/Intramolecular CS Bond Formation
作者:Kiyofumi Inamoto、Chisa Hasegawa、Junpei Kawasaki、Kou Hiroya、Takayuki Doi
DOI:10.1002/adsc.201000604
日期:2010.10.4
Molecularoxygen (O2) was successfully employed as a reoxidant in cyclizations of thiobenzanilides 1a–s through a palladium-catalyzed CH functionalization/intramolecular CS bondformation process, leading to an efficient, green method for the synthesis of 2-arylbenzothiazoles 2a–s. Addition of cesium fluoride (CsF) greatly enhanced the reactions, which produced variously substituted 2-arylbenzothiazoles
Palladium-Catalyzed C-H Cyclization in Water: A Milder Route to 2-Arylbenzothiazoles
作者:Kiyofumi Inamoto、Yoshinori Kondo、Kanako Nozawa
DOI:10.1055/s-0031-1291164
日期:2012.7
medium in palladium-catalyzed C–H cyclization of thiobenzanilides. Reactions efficiently proceeded under considerably mild conditions such as 40 °C in water, providing a more practical, greener method for the synthesis of 2-arylbenzothiazoles. For somesubstrates, the addition of an amphiphilic surfactant greatly enhanced the process. The method represents a rare example of palladium-catalyzed C–H functionalization
在钯催化的硫代苯甲酰苯胺的 C-H 环化中,水被成功用作反应介质。反应在相当温和的条件下有效进行,例如在 40 °C 的水中,为合成 2-芳基苯并噻唑提供了一种更实用、更环保的方法。对于某些基材,添加两亲性表面活性剂大大增强了该过程。该方法代表了在水中进行钯催化的 C-H 功能化过程的一个罕见例子。
Novel methods to functionalize thiazolo[4,5-c]pyridines
作者:Vinay Girijavallabhan、Ashok Arasappan、Frank Bennett、Yuhua Huang、F. George Njoroge、Malcolm MacCoss
DOI:10.1016/j.tetlet.2010.03.069
日期:2010.5
Novel substituted thiazole[4,5-c]pyridines have been synthesized in good yields from unsubstituted thiazole[4,5-c]pyridine using direct C–H coupling reactions and N-oxide rearrangement chemistry.
新型取代的噻唑[4,5- c ]吡啶已通过直接的C-H偶联反应和N-氧化物重排化学反应,由未取代的噻唑[4,5- c ]吡啶合成而得。
Couture, Axel; Grandclaudon, Pierre; Huguerre, Eric, Journal of Heterocyclic Chemistry, 1987, vol. 24, p. 1765 - 1770
作者:Couture, Axel、Grandclaudon, Pierre、Huguerre, Eric