Asymmetric Reduction of<i>tert</i>-Butanesulfinyl Ketimines by N-Heterocyclic Carbene Boranes
作者:Tao Liu、Ling-yan Chen、Zhihua Sun
DOI:10.1021/acs.joc.5b02084
日期:2015.11.20
N-heterocycliccarbeneborane (NHC-borane) based on a triazole core is demonstrated for the first time to be efficient for reduction of a variety of tert-butanesulfinyl ketimines. Up to 95% yield and up to >99% diastereomeric excess were achieved. NHC-borane exhibited excellent activities that are more efficient than or comparable to commonly used reductive reagents such as NaBH4, NaBH3CN, l-selectride
The present invention relates to the use of novel pyrrolopyrazine derivatives of Formula I,
wherein the variables are defined as described herein, which inhibit JAK and SYK and are useful for the treatment of auto-immune and inflammatory diseases.
The present invention relates to the use of novel pyrrolopyrazine derivatives of Formula I,
wherein the variables are defined as described herein, which inhibit JAK and SYK and are useful for the treatment of auto-immune and inflammatory diseases.
Discovery of Bivalent Kinase Inhibitors via Enzyme-Templated Fragment Elaboration
作者:Frank E. Kwarcinski、Michael E. Steffey、Christel C. Fox、Matthew B. Soellner
DOI:10.1021/acsmedchemlett.5b00167
日期:2015.8.13
We have employed novel fragment-based screening methodology to discover bivalent kinase inhibitors with improved selectivity. Starting from a low molecular weight promiscuous kinase inhibitor, we appended a thiol for subsequent reaction with a library of acrylamide electrophiles. Enzyme-templated screening was performed to identify acrylamides that assemble into bivalent inhibitors of c-Src kinase. Upon identification of acrylamide fragments that improve the binding affinity of our lead thiol, we characterized the resulting bivalent inhibitors and identified a series of kinase inhibitors with improved potency and selectivity compared to the thiol-containing precursor. Provided that protein can be prepared free of endogenous reactive cysteines, our methodology is general and could be applied to nearly any enzyme of interest.