稠合噻吩环系统。第三部分 苯并的新合成[ b ]噻吩-2-(3- ħ)-and-3(2 ħ) -酮和苯并〔的一些反应b ]噻吩-2-(3- ħ) -酮与硫酸二甲酯在存在根据
摘要:
苯并[ b ]噻吩-2-(3- ħ) -酮(硫代-羟吲哚)(72%总收率)的制备是通过处理-2,4,6-三- (2-苯并[ b与过氧化氢]噻吩基)cyclotriboroxane 。当将2-苯并[ b ]噻吩基锂依次用硼酸正丁酯和酸处理时,得到环硼烷。3-甲基苯并[ b ]噻吩-2-(3- ħ) -酮和苯并[ b ] -噻吩-3-(2- ħ) -酮,类似地制备(thioindoxyl)。苯并[ b ]噻吩-2(3 H在多种溶剂中,在碱的存在下,用硫酸二甲酯对1)-酮进行了研究。用氢化钠和硫酸二甲酯在六甲基磷酰胺中连续处理该化合物,得到2-甲氧基苯并[ b ]噻吩(90%收率)。
Condensed thiophen ring systems. Part III. A new synthesis of benzo[b]thiophen-2(3H)-and-3(2H)-ones and some reactions of benzo-[b]thiophen-2(3H)-one with dimethyl sulphate in the presence of base
作者:R. P. Dickinson、B. Iddon
DOI:10.1039/j39700001926
日期:——
Benzo[b]thiophen-2(3H)-one (thio-oxindole)(72% overall yield) was prepared by treating 2,4,6-tri-(2-benzo[b]-thienyl)cyclotriboroxane with hydrogen peroxide. The boroxane was obtained when 2-benzo[b]thienyl-lithium was treated successively with n-butylborate and acid. 3-Methylbenzo[b]thiophen-2(3H)-one and benzo[b]-thiophen-3(2H)-one (thioindoxyl) were prepared similarly. The reactions of benzo[b]thiophen-2(3H)-one
苯并[ b ]噻吩-2-(3- ħ) -酮(硫代-羟吲哚)(72%总收率)的制备是通过处理-2,4,6-三- (2-苯并[ b与过氧化氢]噻吩基)cyclotriboroxane 。当将2-苯并[ b ]噻吩基锂依次用硼酸正丁酯和酸处理时,得到环硼烷。3-甲基苯并[ b ]噻吩-2-(3- ħ) -酮和苯并[ b ] -噻吩-3-(2- ħ) -酮,类似地制备(thioindoxyl)。苯并[ b ]噻吩-2(3 H在多种溶剂中,在碱的存在下,用硫酸二甲酯对1)-酮进行了研究。用氢化钠和硫酸二甲酯在六甲基磷酰胺中连续处理该化合物,得到2-甲氧基苯并[ b ]噻吩(90%收率)。
Aldehyde Olefination with Arylboroxines Enabled by Binary Rhodium Catalysis
作者:Zihao Zhang、Jie Jia、Fangdong Hu、Ying Xia
DOI:10.1021/acs.orglett.3c00916
日期:2023.5.12
olefination of aliphatic aldehydes with arylboroxines is described. The simple rhodium(I) complex [Rh(cod)OH]2 without any external ligands or additives is able to catalyze the reaction in air and neutral conditions, allowing the construction of aryl olefins in an efficient manner with a good functional group tolerance. The mechanistic investigation illustrates that the binary rhodium catalysis is the key