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.
One-pot transition-metal-free cascade synthesis of thieno[2,3-c]coumarins from chromones
作者:Yuhong Yang、Xueyu Qi、Ruiling Liu、Qian He、Chunhao Yang
DOI:10.1039/c6ra21776a
日期:——
base-mediated synthesis of a novel series of functionalized thieno[2,3-c]coumarins via a cascade reaction fromchromones has been developed. This cascade reaction involves a Michael addition–Knoevenagel condensation–intramolecular cyclization. This transformation proceeds under mild conditions and gives various thieno[2,3-c]coumarins in good-to-excellent yields. The methodology is tolerant of a wide range
通过色酮的级联反应,开发了一种新型的功能化噻吩并[2,3- c ]香豆素系列产品,可通过一锅法无过渡金属的碱介导合成。该级联反应涉及迈克尔加成-诺文雅格尔缩合-分子内环化。该转化在温和的条件下进行,并以良好至优异的产率得到各种噻吩并[2,3- c ]香豆素。该方法可以耐受多种官能团,并适用于文库合成。