Design and synthesis of condensed thienocoumarins by Suzuki–Miyaura reaction/lactonization tandem protocol
作者:Viktor O. Iaroshenko、Sajid Ali、Satenik Mkrtchyan、Ashot Gevorgyan、Tariq Mahmood Babar、Volodymyr Semeniuchenko、Zahid Hassan、Alexander Villinger、Peter Langer
DOI:10.1016/j.tetlet.2012.10.096
日期:2012.12
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.