Impregnated Ruthenium on Magnetite as a Recyclable Catalyst for the N-Alkylation of Amines, Sulfonamides, Sulfinamides, and Nitroarenes Using Alcohols as Electrophiles by a Hydrogen Autotransfer Process
作者:Rafael Cano、Diego J. Ramón、Miguel Yus
DOI:10.1021/jo200559h
日期:2011.7.15
acid deprotection gave the expected primary amines in good yields. The ruthenium catalyst is quite sensitive, and small modifications of the reaction medium can change the final product. The alkylation of aminesusing potassium hydroxide renders the N-monoalkylated amines, and the same protocol using sodium hydroxide yields the related imines. The catalyst can be easily removed by a simple magnet and
First Asymmetric Synthesis of <i>trans</i>-3,4-Dimethyl-4-arylpiperidines
作者:Daniel P. Furkert、Stephen M. Husbands
DOI:10.1021/ol0713988
日期:2007.9.1
The first asymmetric synthesis of the trans-3,4-dimethyl-4-arylpiperidine opioid antagonist scaffold is reported. C-3 stereochemistry was established via CBS reduction and stereoselective anti-SN2' cuprate displacement of the derived allylic phosphonate. The resultant vinylbromide was then elaborated to the target compound by Suzuki coupling and trans-selective 4-methylation. Extension of this methodology