(±)-2-alkyl-1,2,3,4-tetrahydroquinoline-3-carboxylic esters by a catalyst and pressure dependent tandem reduction-reductive amination reaction
作者:Richard A. Bunce、Takahiro Nago、Nathan Sonobe
DOI:10.1002/jhet.5570440513
日期:2007.9
A series of 2-(2-nitrobenzyl)-substituted β-keto ester derivatives has been subjected to reductive cyclization under catalytic hydrogenation conditions. The reactions were found to be highly dependent on the catalyst and hydrogen pressure used. Hydrogenation over 5% palladium-on-carbon at 4 atmospheres pressure produced complex mixtures of products that included predominantly 1,2,3,4-tetrahydroquinoline