Condensation of ethyl acetoacetate and ethyl 3-oxo-3-(2-furyl-, 2-quinolyl-, 3-pyridyl)propanoates with azomethines of 2-naphthylamine series led to the formation of ethyl (3-arylbenzo[f]quinol-1-yl)acetates and of esters of the corresponding 3-aryl-1-heteryl-2-benzo[f]quinolylcarboxylic acids. The intermediate reaction products were isolated: ethyl 5-(2-naphthylamino)-3-oxo-5-phenylpentanoate, 2-[(aryl)(2-naphthylamino)methyl]-3-heteryl-3-oxopropanoates, dihydro and tetrahydro derivatives of benzoquinolylacetic and benzoquinolinecarboxylic acids.
Nitrosobenzene‐Enabled Chiral Phosphoric Acid Catalyzed Enantioselective Construction of Atropisomeric
<i>N</i>
‐Arylbenzimidazoles
作者:Qian‐Jin An、Wang Xia、Wei‐Yi Ding、Huan‐Huan Liu、Shao‐Hua Xiang、Yong‐Bin Wang、Guofu Zhong、Bin Tan
DOI:10.1002/anie.202111251
日期:2021.11.15
A benzimidazole ring formation strategy for the synthesis of axially chiral N-arylbenzimidazoles by means of chiralphosphoricacid catalysis is presented. Two sets of conditions were developed to transform two classes of 2-naphthylamine derivatives into structurally diverse N-arylbenzimidazole atropisomers with excellent chemo- and regioselectivity as well as high levels of enantiocontrol.