Molecular Diversity from Tonghaosu Analogues, Selective Reduction of theendo-Cyclic Double Bond of Tonghaosu Analogues and the Synthesis of Cyclopentenone Derivatives
Practical access to spiroacetal enol ethers via nucleophilic dearomatization of 2-furylmethylenepalladium halides generated by Pd-catalyzed coupling of furfural tosylhydrazones with aryl halides
Hydroamination of olefin in a special conjugated spiroketal enol ether system, diastereoselective synthesis of amino-containing tonghaosu analogs
作者:Biao-Lin Yin、Tai-Shan Hu、Yu-Lin Wu
DOI:10.1016/j.tetlet.2003.11.106
日期:2004.2
Lithium amide reacted with spiroketal enol ether characterized tonghaosu analog at -78degreesC to give the only hydroamination product 4 in a highly regio- and diastereoselective manner. At a higher temperature, -40degreesC, the presence of free amine was critical for the hydroamination to take place; otherwise, rearrangement of tonghaosu analog to 2,3-dihydrofuran derivative like 6 was the only reaction. (C) 2004 Published by Elsevier Ltd.