作者:Amandine Carrër、Jean-Claude Florent、Emilie Auvrouin、Patricia Rousselle、Emmanuel Bertounesque
DOI:10.1021/jo102265b
日期:2011.4.15
The synthesis of novel 3-aryl-2-arylamidobenzofurans has been accomplished via a Curtius rearrangement strategy in four steps from benzofuran-2-carboxylic acids. The requisite Suzuki−Miyaura cross-coupling, with benzyl 3-bromobenzofuran-2-ylcarbamate or 2-arylamido-3-bromobenzofurans, revealed an unusual reductive debromination process due to the presence of the free NH group. This dehalogenation can
通过Curtius重排策略从苯并呋喃-2-羧酸的四个步骤中完成了新型3-芳基-2-芳基氨基苯并呋喃的合成。必需的Suzuki-Miyaura交叉偶联,与3-溴苯并呋喃-2-基氨基甲酸苄酯或2-芳基氨基-3-溴苯并呋喃,由于游离的NH基团的存在,显示出不寻常的还原脱溴过程。该脱卤化可以通过N-烷基化来抑制。DMAP是一种有效的试剂,可通过芳基化将苯并呋喃-2-基氨基甲酸苄酯一锅转化为相应的苯并呋喃-2-芳基酰胺,因此既可作为酰基转移剂,又可作为Cbz基团的脱保护剂。假定一种机制。