2,3- Diarylbenzo的合成[ b ]噻吩通过镍-催化的Suzuki-Miyaura交叉偶联和钯催化脱羧芳基化
摘要:
我们报告了一种基于镍催化的3-氯-2-甲氧基羰基苯并[ b ]噻吩的镍催化的铃木-宫浦交叉偶联/钯催化的脱羧芳基化序列的2,3-二芳基苯并[ b ]噻吩的新方法可从相应的肉桂酸中获得。另外,该方法可以应用于简并的π-扩展的2,3,6,7-四芳基苯并[1,2- b ; 4,5- b' ]二噻吩的合成。还描述了它们的光学性质。
Design and synthesis of condensed thienocoumarins by Suzuki–Miyaura reaction/lactonization tandem protocol
摘要:
A concise and efficient approach to a series of chromen-4-ones with fused thiophene ring has been developed using the Suzuki-Miyaura reaction of bromothiophene-2- and 3-carboxylates with 2-methoxyboronic acids and subsequent cyclization of prepared alkyl (2-methoxy)aryl thiophene-2- and 3-carboxylates under the action of BBr3/KOtBu. Starting bromothiophenes are easily obtained from corresponding commercially available aminothiophenes by diazotization/bromination reaction. (C) 2012 Elsevier Ltd. All rights reserved.
A novel iodine-catalyzed method for the synthesis of benzothiophene derivatives through cascadereactions of substituted thiophenols with alkynes has been demonstrated under metal- and solvent-freeconditions. The present protocol uses inexpensive and environmentally friendly molecular iodine as the catalyst, and the corresponding products are obtained in moderate to excellent yields. Such an efficient