efficient copper-catalyzed selectivetransferhydrogenation of nitriles to primary amine-boranes and secondary amines with an oxazaborolidine–BH3 complex is reported. The selectivity control was achieved under mild conditions by switching the solvent and the copper catalysts. More than 30 primary amine-boranes and 40 secondary amines were synthesized via this strategy in high selectivity and yields of up to
Effective reductive amination of carbonyl compounds with hydrogen catalyzed by iridium complex in organic solvent and in ionic liquid
作者:Daisuke Imao、Shoichiro Fujihara、Takeshi Yamamoto、Tetsuo Ohta、Yoshihiko Ito
DOI:10.1016/j.tet.2005.05.024
日期:2005.7
compounds with amines has been achieved using homogenous iridiumcatalyst and gaseous hydrogen. It appeared that the cationic iridiumcatalyst, [Ir(cod)2]BF4, without any other ligands was sufficient for the reaction. For the DRA of the ketone substrates, an ionicliquid, [Bmim]BF4, was found to be superior to the other organic solvent used. Especially, the counter anion of the ionicliquid has a significant
Two practical and efficient approaches have been implemented as alternative procedures for the synthesis of naftifine and novel diversely substituted analogues 16 and 20 in good to excellent yields, mediated by Mannich-type reactions as the key step of the processes. In these approaches, the γ-aminoalcohols 15 and 19 were obtained as the key intermediates and their subsequent dehydration catalyzed
Aza-peptidyl Michael Acceptors. A New Class of Potent and Selective Inhibitors of Asparaginyl Endopeptidases (Legumains) from Evolutionarily Diverse Pathogens
作者:Marion G. Götz、Karen Ellis James、Elizabeth Hansell、Jan Dvořák、Amritha Seshaadri、Daniel Sojka、Petr Kopáček、James H. McKerrow、Conor R. Caffrey、James C. Powers
DOI:10.1021/jm701311r
日期:2008.5.1
results suggest an evolutionary constraint on the topography of the prime side of the activesite. SAR also revealed that esters in the P1' position are more potent than disubstituted amides and that monosubstituted amides and alkyl derivatives show little or no inhibition. The preferred P1' residues have aromatic substituents. Aza-asparaginyl Michael acceptors react with thiols, which provides insight
Expanding Water/Base Tolerant Frustrated Lewis Pair Chemistry to Alkylamines Enables Broad Scope Reductive Aminations
作者:Valerio Fasano、Michael J. Ingleson
DOI:10.1002/chem.201605466
日期:2017.2.10
combinations of water/strong Brønsted bases than B(C6 F5 )3 , this enables Si-H bond activation by a frustrated Lewis pair (FLP) mechanism to proceed in the presence of H2 O/alkylamines. Specifically, BPh3 has improved water tolerance in the presence of alkylamines as the Brønsted acidic adduct H2 O-BPh3 does not undergo irreversible deprotonation with aliphatic amines in contrast to H2 O-B(C6 F5 )3