Palladium Catalyzed Ring Expansion Reaction of Isoxazolones with Isocyanides: Synthesis of 1,3‐Oxazin‐6‐One Derivatives
作者:Yi‐Ming Zhu、Wan Zhang、Hongkun Li、Xiao‐Ping Xu、Shun‐Jun Ji
DOI:10.1002/adsc.202001200
日期:2021.2.2
A palladium catalyzed ringexpansionreaction of isoxazolones with isocyanides was disclosed. In the reaction, a cascade process involving ring‐opening/cyclization was suggested. The reaction features high atomic economy due to no elimination of CO2 occurred. Moreover, products obtained demonstrate aggregation‐induced emission properties with relatively high solid‐state emission efficiencies.
A highly regioselective and enantioselective N-alkylation of isoxazol-5-ones with para-quinone methides promoted by bi-functional squaramide catalysts was developed. This unexpected asymmetric N-addition of isoxazolinones afforded a series of enantioenriched N-diarylmethane substituted isoxazolinones with high yields and enantioselectivities (up to 97 : 3 er). This reaction not only provides a useful
pyrimido[1,2-a]indol-4-ol heteroarenes via a Cp*Rh(III)-catalyzed cascade C−Hactivation/annulation strategy employing N-methoxyindoleamides and isoxazolones is developed. Also, a framework of 3-methoxy-2,3-dihydro-[1,3,5]triazino[1,2-a]indole-4,10-dione was successfully synthesized via a Cp*Rh-catalyzedC−Hactivation/annulation/oxidation reaction between N-(methyloxy)-1H-indole-1-carboxamide and isoxazolones