Synthesis of Carboranylated Dihydropyrrolo[1,2-<i>a</i>]quinoxalines and Dihydroindolo[1,2-<i>a</i>]quinoxalines by BF<sub>3</sub>·OEt<sub>2</sub>-Catalyzed Heterocyclization of <i>C</i>-Formyl-<i>o</i>-carboranes and Investigation of Their Oxidation Stability
作者:Zhen-Zhen Sun、Pan Gao、Yong Yang、Tao Wang、Xiao-Jun Wu、You-Qing Wang
DOI:10.1021/acs.joc.3c02443
日期:2024.3.1
BF3·OEt2-catalyzed synthesis of carboranylated dihydropyrrolo[1,2-a]quinoxalines and dihydroindolo[1,2-a]quinoxalines in 30–99% yields is presented through the heterocyclization of various C-modified C-formyl-o-carboranes with 1-(2-aminophenyl)-pyrroles/indoles. A systematic comparative investigation of their oxidation stability in air confirmed that 4-carboranyl-4,5-dihydropyrrolo[1,2-a]quinoxaline had better
通过各种C-修饰的C-甲酰基-的杂环化,BF 3 ·OEt 2催化合成碳硼酰化二氢吡咯并[1,2- a ]喹喔啉和二氢吲哚并[1,2- a ]喹喔啉,产率30-99%邻碳硼烷与1-(2-氨基苯基)-吡咯/吲哚。对它们在空气中氧化稳定性的系统比较研究证实,4-碳硼基-4,5-二氢吡咯并[1,2- a ]喹喔啉比4-苯基类似物具有更好的稳定性。 N-乙酰基取代的碳硼酰化二氢吡咯并[1,2- a ]喹喔啉的笼式脱硼反应产生相应的7,8-硝基-碳硼烷铯盐。还实现了动力学拆分,以获得带有碳硼烷笼碳键合手性立体中心的光学纯碳硼酰化N-杂环支架。