Triton-B Adsorbed on Flysh: An Efficient Support for the Base Catalysed Reactions under Microwave Irradiations
作者:VIJENDER GOEL
DOI:10.13005/ojc/280422
日期:2012.12.22
application of Triton-Badsorbed on flyash (a waste material of thermal plants ) has been reported for the variety of basecatalysedreactions such as synthesis of cinnamic acids by Deobner reaction, synthesis of 1-(2-hydroxyphenyl)-5-phenylpent-4-ene-1, 3-diones by Baker- Venkataraman reaction and synthesis of 3-carboxycoumarins by knoevenagel reaction. This material also acts as a support for the reaction
The Asymmetric Synthesis of Polycyclic Tetrahydroxanthone via the Cascade Reaction of Alkene‐Substituted 1,3‐diketones and Alkenyloxindoles
作者:Rong Zhang、Wenhui Wang、Yonghui Zhang、Yushuang Chen、Weijun Yao、Zhen Wang
DOI:10.1002/adsc.202400113
日期:2024.4.23
An enantioselective access to polycyclic tetrahydroxanthone compounds was achieved through an organocatalyzed cascade reaction of alkene‐substituted 1,3‐diketones and alkenyloxindoles, using quinine‐derivedsquaramide as an efficient catalyst. It afforded a variety of optically active spirooxindole‐based tetrahydroxanthones with 18‐94% yields, >19:1 dr, and 86‐99% ee.