Aromatic Ring Opening of Fused Thiophenes via Organolithium Addition to Sulfur
作者:B. Hill、M. De Vleeschauwer、K. Houde、M. Belley
DOI:10.1055/s-1998-1674
日期:1998.4
Organolithium reagents can add to the sulfur atom of thiophenes that are substituted by a chlorine atom and fused to another aromatic system, at -78 °C, to give ortho-substituted aryl sulfides.
有机锂试剂可以与被氯原子取代并与另一个芳族系统稠合的噻吩的硫原子加成,在 -78 °C 下,得到邻位取代的芳基硫化物。
Inexpensive NaX (X = I, Br, Cl) as a halogen donor in the practical Ag/Cu-mediated decarboxylative halogenation of aryl carboxylic acids under aerobic conditions
作者:Zhengjiang Fu、Ligao Jiang、Qianming Zuo、Zhaojie Li、Yanzhu Liu、Zhenhong Wei、Hu Cai
DOI:10.1039/c8ob01095a
日期:——
NaX (X = I, Br, Cl) has been achieved under aerobic conditions in moderate to good yields. The halodecarboxylation is shown to be an effective strategy for S-containing heteroaromatic carboxylic acid and benzoic acids with nitro, chloro and methoxyl substituents at the ortho position. A gram-scale reaction and a three-step procedure to synthesize iniparib have been performed to evaluate the practicality
Benzo[b]thiophenium S,C-ylides: Preparation, structure and comparison with thiophenium analogues
作者:Eino Vuorinen、Anthony A. Chalmers、Jan L.M. Dillen、Tomasz A. Modro
DOI:10.1016/s0040-4020(01)82404-2
日期:1991.9
13C) studies revealed that ylides substituted additionally at position 2 of the thiophene ring can exist as pairs of diastereoisomers, not interchangeable at room temperature. The slow exchange between two sites was attributed to the restricted rotation about the ylidic SC bond. The crystalstructure determined for one ylide demonstrated different molecular environment for two parts of the β-dicarbonyl