A Simple One-Pot Synthesis of 2,6-Disubstituted 4-(Polyfluoroalkyl)pyridines and -pyrimidines by Reaction of 2-Polyfluoroalkylchromones with Aromatic Methyl Ketimines and Amidines
Enantioselective reduction of <i>N</i>-alkyl ketimines with frustrated Lewis pair catalysis using chiral borenium ions
作者:Dan M. Mercea、Michael G. Howlett、Adam D. Piascik、Daniel J. Scott、Alan Steven、Andrew E. Ashley、Matthew J. Fuchter
DOI:10.1039/c9cc02900a
日期:——
Enantioselective reduction of ketimines was demonstrated using chiral N-heterocyclic carbene (NHC)-stabilised borenium ions in frustratedLewispair catalysis. High levels of enantioselectivity were achieved for substrates featuring secondary N-alkyl substituents. Comparative reactivity and mechanistic studies identify key determinants required to achieve useful enantioselectivity and represent a step
A compound represented by the following general formula (1), or a salt thereof has serine protease inhibiting activity, and particularly excellent inhibiting activity against clotting factor VIIa. This compound or a salt thereof is useful as therapeutic and/or prophylactic agents for diseases associated with thrombus formation.
[wherein R
1
represents hydrogen, R
2
represents optionally substituted phenyl, etc., R
3
represents optionally substituted C6-10 aryl, etc.]
several applications and as precursors for some classes of molecules. They serve as ligands' in the preparation of rhodium complex catalysts, possess interesting antifungal properties,' and are starting materials for the synthesis of 4H-chromen-4-ylidenamines.' Moreover, the stereoselective reduction of imidoyl phenols is a convenient synthetic pathway to aminophenols, another class of ligands extremely
Lanthanide Triflate Catalysed Reactions of Acetals with Primary Amines and Cascade Cyclisation Reactions
作者:Harry Heaney、Michael T. Simcox、Alexandra M. Z. Slawin、Robert G. Giles
DOI:10.1055/s-1998-1734
日期:1998.6
The formation of imines from acetals and primary amines can be carried out at significantly lower temperatures using scandium or lanthanide triflates as catalysts, than in the absence of a catalyst: the intermediate aminol ethers can also take part in cascade cyclisation reactions, for example using tryptamine and ethyl tryptophanate.
Heterobifunctional poly(ethyleneglycol) containing acid-labile amino protecting groups and uses thereof
申请人:Breitenkamp Kurt
公开号:US20080188638A1
公开(公告)日:2008-08-07
The present invention provides bifunctional polymers, methods of preparing the same, and intermediates thereto. These compounds are useful in a variety of applications including the PEGylation of biologically active molecules. The invention also provides methods of using said compounds and compositions thereof.