A highly enantioselective asymmetric Darzens reaction catalysed by proline based efficient organocatalysts for the synthesis of di- and tri-substituted epoxides
A new class of easily available and readily tunable proline based chiral organocatalysts was found to efficiently catalyse an unprecedented highly enantioselective asymmetric Darzens reaction of α-chloro ketones and substituted α-chloro ketones with various aldehydes, which directly produces optically active di- and tri-substituted chiral epoxides with higher product yields (up to 97 %) and excellent
Catalytic asymmetric Darzens reaction promoted by a chiral phase-transfer catalyst derived from cinchonine is described. The desired α,β-epoxy ketones were obtained by use of α-chloro acyclic and cyclic ketones as substrates with moderate to high enantiomeric excesses under mild reaction conditions. This methodology can be quite an effective protocol for practical asymmetric synthesis.
A compound of formula I wherein R, Re, Rb, Rc, Rd and Re are as defined in the, specification, processes for their production, their uses, in particular in transplantation, and pharmaceutical compositions containing them.
Indolyl-naphthyl-maleimides as potent and selective inhibitors of protein kinase C-α/β
作者:Maurice J. van Eis、JeanPierre Evenou、Walter Schuler、Gerhard Zenke、Eric Vangrevelinghe、Juergen Wagner、Peter von Matt
DOI:10.1016/j.bmcl.2017.01.038
日期:2017.2
The indolyl-naphthyl maleimide 7 is a potentinhibitor of the classical PKC isotypes α,β and shows excellent selectivity over the novel PKC isotypes δ,ε,η,θ and other kinases belonging to the AGC family. The SAR around 7 as well as the physico-chemical characteristics of selected derivatives and their activity in T and B cell activation and proliferation assays are discussed.