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.
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