La(OTf)<sub>3</sub>-Catalyzed [3+2] Cycloaddition Reactions for the Synthesis of Benzo[<i>d</i>]oxazoles/Benzofurans
作者:Zhanjun Li、Yalin Zhang、Manman Sun、Ye Zhang、Zhaoxiang Lu、Yupeng Deng、Xianqiang Huang、Guodong Shen
DOI:10.1021/acs.joc.3c02641
日期:2024.3.15
The La(OTf)3-catalyzed [3+2] cycloaddition reactions for the synthesis of benzo[d]oxazoles/benzofurans via quinones and 1,2-di-tert-butyl-3-(cyanimino)diaziridine (1,3-di-tert-butyl-2-cyanoguanidine)/vinyl azides have been explored. A series of 5-hydroxybenzofuran-4-carboxylic acid derivatives and 5-hydroxybenzo[d]oxazole-4-carboxylic acid derivatives were conveniently obtained with high yields and
La(OTf) 3催化的[3+2]环加成反应通过醌和1,2-二叔丁基-3-(氰胺基)二氮丙啶合成苯并[ d ]恶唑/苯并呋喃(1,3-二叔丁基-2-氰基胍)/乙烯基叠氮化物已被探索。方便地得到了一系列5-羟基苯并呋喃-4-甲酸衍生物和5-羟基苯并[ d ]恶唑-4-甲酸衍生物,收率高,立体选择性好,可用于进一步转化为有价值的化合物。