The contra-thermodynamic isomerization of α- and β-substituted cinnamate derivatives catalyzed by the Cu(OAc)2/rac-BINAP complex under blue light irradiation is reported. The use of an oxazolidinone template, which favored the complexation of the copper catalyst to the substrate, allowed the E → Z isomerization of the catalytically formed chromophore under simple and robust reaction conditions in good
Polyethyleneimine-Supported Triphenylphosphine and Its Use as a Highly Loaded Bifunctional Polymeric Reagent in Chromatography-Free One-Pot Wittig Reactions
作者:Patrick Toy、Xuanshu Xia
DOI:10.1055/s-0034-1380810
日期:——
rted triphenylphosphine reagent has been synthesized and used as a highly loaded bifunctional homogeneous reagent in a range of one-potWittigreactions that afforded high yields of the desired products after simple purification procedures. The approach also served efficiently in tandem reaction sequences involving a one-potWittigreaction followed by conjugate reduction of the newly formed alkene
A Ru-catalyzed direct oxidative cross-coupling reaction of acrylates was developed. It offers a straightforward and atom-economical protocol for the synthesis of functionalized (Z,E)-muconate derivatives in moderate to good yields with good stereo- and chemoselectivities. The conjugated muconates bearing differentiable terminal functionality can be selectively transformed into versatile synthetic intermediates
The present invention provides a pharmaceutical which possesses an excellent inhibitory effect on NHE3 (Na
+
/H
+
exchanger type 3) and effectively improves diseases or conditions of organs in which NHE3 is expressed.
Highly enantioselective hydrogenation of a variety of 2-substituted-2-alkenols has been achieved using a ChenPhosâRh complex as catalyst, giving â¥99% ee for most substrates. Optically active antifungal agent amorolfine was first synthesised using hydrogenation as the key step.