Modular, efficient synthesis of asymmetrically substituted piperazine scaffolds as potent calcium channel blockers
作者:Andrey Borzenko、Hassan Pajouhesh、Jerrie-Lynn Morrison、Elizabeth Tringham、Terrance P. Snutch、Laurel L. Schafer
DOI:10.1016/j.bmcl.2013.03.114
日期:2013.6
A novel approach to the synthesis of substituted piperazines and their investigation as N-type calcium channel blockers is presented. A common scaffold exhibiting high activity as N-type blockers is N-substituted piperazine. Using recently developed titanium and zirconium catalysts, we describe the efficient and modularsynthesis of 2,5-asymmetrically disubstituted piperazines from simple amines and
The Direct Synthesis of Unsymmetrical Vicinal Diamines from Terminal Alkynes: A Tandem Sequential Approach for the Synthesis of Imidazolidinones
作者:Laurel Schafer、Alison Lee、Melanie Sajitz
DOI:10.1055/s-0028-1083279
日期:2009.1
reaction is used in the synthesis of unsymmetrical vicinal diamines via the one-pot synthesis of α-cyanoamines. This methodology is further applied to the efficient synthesis of imidazolidinones. An easy-to-use bis(amidate)titanium precatalyst permits efficient approaches to heterocyclic chemistry from terminal alkynes. hydroamination - titanium - amines - heterocycles - tandem reactions