Synthesis of spiroindolone scaffolds by Pictet-Spengler spirocyclisation using β-cyclodextrin-SO3H as a recyclable catalyst
作者:Tukaram D. Urmode、Monali A. Dawange、Vaishali S. Shinde、Radhika S. Kusurkar
DOI:10.1016/j.tet.2017.05.089
日期:2017.7
A recyclablecatalyst, β-cyclodextrin-SO3H in aqueous medium was used effectively for the synthesis of spiroindolones (tetrahydrospiro-β-carbolines as well as tetrahydrospiro-γ-carbolines) in a Pictet-Spengler spirocyclisation. The products were obtained in good yield in an environmental friendly procedure.
Polymer‐Supported Phosphoric‐Acid Catalysed Enantioselective Pictet‐Spengler Cyclisation for the Synthesis of Quaternary Tryptolines in Batch/Continuous Flow
作者:Moreshwar B. Chaudhari、Prachi Gupta、Patricia Llanes、Miquel A. Pericàs
DOI:10.1002/adsc.202201275
日期:2023.2.21
the reaction has been demonstrated in continuous flow, with a residence time of only 24 minutes. The robust immobilized catalyst has been recycled and reused multiple times in batch and flow. The synthesis of the chiral precursors of Tadalafil, the Iboga-type alkaloid (+)-Tabertinggine and antimalarial spiroindolinones has been achieved in batch and continuous-flow.
Pentafluorophenol (C
<sub>6</sub>
F
<sub>5</sub>
OH) Catalyzed Pictet‐Spengler Reaction: A Facile and Metal‐Free Approach Towards Tetrahydro‐
<i>β</i>
‐Carbolines
作者:Rina Mahato、Chinmoy Kumar Hazra
DOI:10.1002/chem.202203924
日期:——
Pictet-Spengler reaction, which synthesizes to synthesize (spirocyclic) tetrahydro β carbolines. This simple catalytic methodology uses features mild conditions to generate high yields of indolealkaloids to produce indolealkaloids in high yield with remarkable functional group tolerance, including late-stage modifications. This strategy demonstrates a practical approach for synthesizing to the synthesis of the
作者:Zhao, Xiao-Ting、Li, Wen-Dian、Tao, Fei-Yan、Wang, Na
DOI:10.1007/s10562-024-04698-8
日期:——
Pictet-Spengler reaction catalyzed by amino acids has been rarely described. Herein, we report the cysteine-catalyzed Pictet-Spengler reaction between tryptamine and isatin under metal-free and convenient conditions. The catalytic performance of amino acid was optimized through screening reaction conditions such as time, temperature, solvent, molar ratio and catalyst amount and a series of spiroindolones
Microporous Schiff base network polymer as an efficient catalyst for the synthesis of spirooxindole tetrahydro-β-carbolines via Pictet–Spengler reaction
tetrahydro-β-carboline are important chemical motifs that are widely found in natural products and drug molecules. Herein, we report an efficient, recoverable, nitrogen-rich melamine-based microporousSchiffbase network (SNW) polymer as a catalyst for the Pictet–Spengler reaction of isatins with tryptamines. A series of desired spirooxindole tetrahydro-β-carbolines was achieved in excellent yields (up to 99%)