Rhodium(III)-Catalyzed [4+3] Annulation of <i>N</i>-Aryl-pyrazolidinones and Propargylic Acetates: Access to Benzo[<i>c</i>][1,2]diazepines
作者:Tingfang Li、Zi Yang、Zhenyu Song、Remi Chauvin、Xiuling Cui
DOI:10.1021/acs.orglett.0c01139
日期:2020.6.5
The generation of 2,3-dihydro-benzo[c][1,2]diazepine derivatives via rhodium(III)-catalyzed [4+3] annulation of pyrazolidinones and propargylic acetates is disclosed. The reaction proceeds smoothly under relatively mild conditions from propargylic acetates as novel C3 synthons. A range of dinitrogen-fused heterocyclic compounds are readily accessed by this approach.
公开了通过铑(III)催化的吡唑烷酮和乙酸炔丙基酯的[4 + 3]环化反应生成2,3-二氢-苯并[ c ] [1,2]二氮杂卓衍生物。在相对温和的条件下,由炔丙基乙酸酯作为新型C 3合成子,可使反应平稳进行。通过该方法可以容易地获得许多二氮稠合的杂环化合物。
Rapid Construction of Hexacyclic Indolines via the Ru(II)-Catalyzed C–H Activation Initiated Cascade Cyclization of Phenidones with Enynones
initiated indole formation/Diels–Alder reaction/iminium ion cyclization sequence, which afforded hexacyclic indolines as single diastereomer in good to excellent yields with a broad substrate scope under mild conditions. The reaction features the simultaneous generation of five new chemical bonds and four new rings in one pot, providing a rapid and concise approach toward polycyclic indoline alkaloids and
A novel one-pot approach to oxidative aromatization and bromination of pyrazolidin-3-one with HBr-H<sub>2</sub>O<sub>2</sub> system
作者:Shanguang Yang、Jingjing Liu、Zhudan Jin、Wei Tian、Hao Sun、Mingliang Wang
DOI:10.1515/hc-2018-0046
日期:2018.6.27
Abstract An efficient and green one-pot method for the oxidative aromatization and bromination of pyrazolidin-3-ones under mild conditions with a HBr-H2O2 system was developed. A mechanism was proposed.
Synthesis of pyrazolidinone fused cinnolines via the cascade reactions of 1-phenylpyrazolidinones with vinylene carbonate
作者:Na Li、Xinying Zhang、Xuesen Fan
DOI:10.1016/j.tetlet.2022.153984
日期:2022.8
Presented herein is an efficient synthesis of pyrazolidinone fused cinnolines through the cascade reactions of 1-phenylpyrazolidinones with vinylene carbonate. The reaction is initiated by C–H bond cleavage followed by C–C/C–N bonds formation and double C–O bonds cleavage. To our knowledge, this is the first example in which pyrazolidinone fused cinnoline derivatives free of redundant substituents