Carbohydrates as efficient catalysts for the hydration of α-amino nitriles
作者:Sampada Chitale、Joshua S. Derasp、Bashir Hussain、Kashif Tanveer、André M. Beauchemin
DOI:10.1039/c6cc07530d
日期:——
Directed hydration of alpha-amino nitriles was achieved under mild conditions using simple carbohydrates as catalysts exploiting temporary intramolecularity. A broadly applicable procedure using both formaldehyde and NaOH as catalysts efficiently hydrated a variety of primary and secondary susbtrates, and allowed the hydration of enantiopure substrates to proceed without racemization. This work also
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