Microwave-Accelerated Methodology for the Direct Reductive Amination of Aldehydes
作者:Jussi J. Kangasmetsä、Tony Johnson
DOI:10.1021/ol0522844
日期:2005.12.1
[GRAPHICS]An improved procedure for the direct reductive amination of aldehydes was developed which uses dibutyltin dichloride as catalyst in the presence of phenylsilane as reductant. Rapid reaction is promoted by the use of microwave conditions with anilines, secondary and primary amines being suitable reactants.
Substituents on Quinone Methides Strongly Modulate Formation and Stability of Their Nucleophilic Adducts
作者:Emily E. Weinert、Ruggero Dondi、Stefano Colloredo-Melz、Kristen N. Frankenfield、Charles H. Mitchell、Mauro Freccero、Steven E. Rokita
DOI:10.1021/ja062948k
日期:2006.9.1
and regenerates its QM with a half-life of approximately 5 h. The generality of these effects is demonstrated with a series of alternative quinone methide precursors (QMP) containing a variety of substituents attached at different positions with respect to the exocyclic methylene. The rates of nucleophilic addition to substituted QMs measured by laser flash photolysis similarly span 5 orders of magnitude