苯并[ b ]噻吩杂环是许多重要的小分子药物和候选药物以及有机半导体材料的重要组成部分。已经开发了许多通过炔烃的环化反应来构建苯并[ b ]噻吩核的方法。尽管公开的催化反应很少,但是大多数方法依赖于炔烃的化学计量活化。在这里我们报告了一种由金催化的由2-炔基硫代苯甲醚合成2-取代的苯并[ b ]噻吩的有效方法(I)– IPr氢氧化物,适用于具有多种电子和空间特性的多种底物。另外,我们通过实验证明了酸添加剂及其共轭碱对催化剂周转至关重要。
The present invention provides compounds which promote erythropoietin production. Compounds represented by the following general formula (1) or pharmacologically acceptable salts thereof are provided:
[wherein, R
1
represents a group —X-Q
1
, X-Q
1
-Y-Q
2
or X-Q
1
-Y-Q
2
-Z-Q
3
, X represents a single bond, —CH
2
— or the like, Q
1
represents a monocyclic or bicyclic heterocyclic group which may have substituent(s), Y represents a single bond, —CH
2
—, or the like, Q
2
represents a monocyclic or bicyclic hydrocarbon ring group which may have substituent(s) or a monocyclic or bicyclic heterocyclic group which may have substituent(s), Z represents a single bond, —CR
11
R
12
— or the like, R
11
and R
12
each independently represents a hydrogen atom, a halogen atom or the like, Q
3
represents a phenyl group which may have substituent(s), a C
3
-C
7
cycloalkyl group which may have substituent(s), a C
3
-C
7
cycloalkenyl group which may have substituent(s) or a monocyclic or bicyclic heterocyclic group which may have substituent(s), R
2
represents a C
1
-C
3
alkyl group or the like, and R
3
represents a hydrogen atom or a methyl group].
Three-component 2-aryl substituted benzothiophene formation under transition-metal free conditions
作者:Pengcheng Jiang、Xingzong Che、Yunfeng Liao、Huawen Huang、Guo-Jun Deng
DOI:10.1039/c6ra07730g
日期:——
A base-mediated 2-aryl substituted benzothiopheneformation from 2-bromobenzene aldehydes, benzylic esters and elemental sulfur under transition-metal-free conditions is described. Various 2-aryl substituted benzothiophene were efficiently obtained under mild conditions.
Regioselective Direct C2 Arylation of Indole, Benzothiophene and Benzofuran: Utilization of Reusable Pd NPs and NHC-Pd@MNPs Catalyst for C–H Activation Reaction
作者:Rajeev V. Hegde、Tiow-Gan Ong、Ram Ambre、Arvind H. Jadhav、Siddappa A. Patil、Ramesh B. Dateer
DOI:10.1007/s10562-020-03390-x
日期:2021.5
A regioselective C2 arylation of indoles, benzothiophene and benzofuran without directing group has been accomplished using economically cheap Pd NPs and NHC-Pd@MNPs catalyst. The reusablecatalyst is efficiently employed to access C2 arylated heterocycles in good to excellent yield. The reusability of the catalyst is studied up to five cycles and a gram-scale synthesis has been achieved. The reaction
Pd-Catalyzed β-Selective Direct C–H Bond Arylation of Thiophenes with Aryltrimethylsilanes
作者:Kenji Funaki、Tetsuo Sato、Shuichi Oi
DOI:10.1021/ol3029109
日期:2012.12.21
Direct arylation of thiophenes and benzothiophenes with aryltrimethylsilanes was effectively catalyzed by PdCl2(MeCN)2 in the presence of CuCl2 as an oxidant. The reaction preferentially occurred at the β-position of both thiophenes and benzothiophenes.