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
Molecular oxygen (O2) was successfully employed as a reoxidant in cyclizations of thiobenzanilides 1a–s through a palladium-catalyzed CH functionalization/intramolecular CS bond formation 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
通过钯催化的CH官能化/分子内CS键形成过程,分子氧(O 2)被成功地用作环氧化苯硫基苯甲腈1a - s的再氧化剂,从而导致了一种高效,绿色的合成2-芳基苯并噻唑2a - s的方法。。氟化铯(CsF)的加入大大增强了反应,产生了具有良好官能团耐受性的各种取代的2-芳基苯并噻唑。还发现硫脲4a – j是使用钯/ O 2催化剂体系进行环化过程的合适底物,因此生成了2-氨基苯并噻唑5a – j。Ĵ。由芳基异硫氰酸酯6和胺7一锅法合成2-氨基苯并噻唑5a – j也很成功。