conditions led to the finding that the catalytic system based on the (cyclooctadiene)rhodium chloride dimer, [Rh(cod)Cl]2, in combination with the ligand xantphos and an acid co‐catalyst results in high selectivity for the desired product. Under optimized conditions nearly full conversion is reached with high selectivity to the desired N‐alkylamide and with a very high N‐alkylamide/alcohol ratio, while producing
thiourea 1a catalyzes aza-Henryreaction of nitroalkanes with N-Boc-imines to give syn-beta-nitroamines with good to high diastereo- and enantioselectivity. Apart from the catalyst, the reaction requires no additional reagents such as a Lewis acid or a Lewis base. The N-protecting groups of the imines have a determining effect on the chirality of the products, that is, the reaction of N-Boc-imines gives
Inhibition of the Human Proteasome by Imidazoline Scaffolds
作者:Lauren M. Azevedo、Theresa A. Lansdell、Jacob R. Ludwig、Robert A. Mosey、Daljinder K. Woloch、Dillon P. Cogan、Gregory P. Patten、Michael R. Kuszpit、Jason S. Fisk、Jetze J. Tepe
DOI:10.1021/jm400235r
日期:2013.7.25
The proteasome has emerged as the primary target for the treatment of multiple myeloma. Unfortunately, nearly all patients develop resistance to competitive-type proteasome inhibitors such as bortezomib. Herein, we describe the optimization of noncompetitive proteasome inhibitors to yield derivatives that exhibit nanomolar potency (compound 49, IC50 130 nM) toward proteasome inhibition and overcome bortezomib resistance. These studies illustrate the feasibility of the development of noncompetitive proteasome inhibitors as additives and/or alternatives to competitive proteasome inhibitors.
A Facile Method for the Synthesis of Substituted<i>N</i>-Methylenecarboxamides and Alkyl<i>N</i>-Methylenecarbamates