Activation Relay on Rhodium-Catalyzed C–H Aminomethylation in Cooperation with Photoredox Catalysis
作者:Ruixing Liu、Jiaxin Liu、Yin Wei、Min Shi
DOI:10.1021/acs.orglett.9b01261
日期:2019.6.7
A site selective C–H aminomethylation at indole’s C3 position has been achieved by merging rhodium(III)-catalyzed C–H activation and photoredox catalysis in a one-pot manner. An investigation of the mechanistic insights rationalized the essence of the activation relay and the combination mode.
Enantioselective Mannich Reaction Employing 1,3,5-Triaryl-1,3,5-triazinanes Catalyzed by Chiral-at-Metal Rhodium Complexes
作者:Jun Gong、Shi-Wu Li、Saira Qurban、Qiang Kang
DOI:10.1002/ejoc.201700463
日期:2017.7.7
Chiral-at-metal Rh(III) complexes catalyzed highly efficient enantioselectiveMannichreaction of 2-acyl imidazoles with 1,3,5-triazinanes is developed, affording the corresponding adducts in 81-99% yields with up to >99% enantioselectivities. This protocol performs with 0.1 mol % of Rh(III) complex on gram scale without loss in enantioselectivity.
Metal-free [2 + 1 + 3] Cycloaddition of Trifluoroacetaldehyde <i>N</i>-Sulfonylhydrazones with Hexahydro-1,3,5-triazines Leading to Trifluoromethylated 2,3,4,5-Tetrahydro-1,2,4-triazines
作者:Zhongxue Fang、Qihao Jin、Xinyu Wang、Yongquan Ning
DOI:10.1021/acs.joc.1c02810
日期:2022.3.4
A transition-metal-free [2 + 1 + 3] cycloaddition of trifluoroacetaldehyde N-sulfonylhydrazone and hexahydro-1,3,5-triazine was described. This operationally simple protocol provides a general synthesis of diverse trifluoromethylated 2,3,4,5-tetrahydro-1,2,4-triazines in 81–97% yield with a broad substrate scope, including aryl, benzyl, and alkyl hexahydro-1,3,5-triazine.
A highly efficient asymmetric Mannich-type reaction between α-tetralone-derived β-keto esters/amides and 1,3,5-triaryl-1,3,5-triazinanes was realized in the presence of chiral N,N′-dioxide–Ni(II) or Mg(II) complex. A variety of optically active β-amino compounds with all-carbon quaternary stereocenters were obtained in good yields with excellent enantioselectivities. A possible transition state was
Rhodium
<sup>III</sup>
/
<scp>
Silver
<sup>I</sup>
</scp>
Relay Catalyzed C—H Aminomethylation with Imine Equivalents and Lewis Acid Catalyzed [4+2] Cycloaddition of Indoles with Triarylhexahydrotriazine
<sup>†</sup>
作者:Ruixing Liu、Yin Wei、Min Shi
DOI:10.1002/cjoc.202000018
日期:2020.9
bioactive compounds. We revealed the C3‐selectivity of this reaction through a detailed mechanistic investigation. Meanwhile, during the examination of the reaction conditions, we discovered another [4+2] cycloaddition pathway to afford tetrahydro‐indolo[3,2‐c]quinoline scaffold products via silver or Lewisacid catalysis.
本文报道了Rh III / Ag I中继催化吲哚与三芳基六氢三嗪(THT)的C(sp 2)-H偶联。合并Rh III催化的C(sp 2)-H键活化和银促进的THT解离后,便发现了有效的吲哚的C3氨基甲基化方案,可提供高收率的C3氨基甲基吲哚,并显示出用于合成复杂生物活性化合物的潜在应用。我们通过详细的机理研究揭示了该反应的C3选择性。同时,在检查反应条件期间,我们发现了另一种[4 + 2]环加成途径,可提供四氢-吲哚[3,2- c ]喹啉支架产品通过银或路易斯酸催化。