Exploring the Promiscuous Enzymatic Activation of Unnatural Polyketide Extender Units in Vitro and in Vivo for Monensin Biosynthesis
作者:Marius Grote、Frank Schulz
DOI:10.1002/cbic.201800734
日期:2019.5.2
The incorporation of new-to-nature extender units into polyketide synthesis is an important source for diversity yet is restricted by limited availability of suitably activated building blocks in vivo. We here describe a straightforward workflow for the biogenic activation of commercially available new-to-nature extender units. Firstly, the substrate scope of a highly flexible malonyl co-enzyme A synthetase
Macrolactam Synthesis via Ring-Closing Alkene–Alkene Cross-Coupling Reactions
作者:Manikantha Maraswami、Jeffrey Goh、Teck-Peng Loh
DOI:10.1021/acs.orglett.0c03801
日期:2020.12.18
Reported herein is a practical method for macrolactam synthesis via a Rh(III)-catalyzed ring closing alkene–alkene cross-couplingreaction. The reaction proceeded via a Rh-catalyzed alkenyl sp2 C–H activation process, which allows access to macrocyclic molecules of different ring sizes. Macrolactams containing a conjugated diene framework could be easily prepared in high chemoselectivities and Z,E
A tethering directing group strategy for ruthenium-catalyzed intramolecular alkene hydroarylation
作者:Praveen Kilaru、Sunil P. Acharya、Pinjing Zhao
DOI:10.1039/c7cc08704g
日期:——
N-heterocycle synthesis that utilizes an alkene-tethered amide moiety as a directing group for aromatic C–H activation. This tethering directing group strategy is demonstrated in a ruthenium-catalyzed intramolecular alkene hydroarylation with N-aryl acrylamides to form oxindole products.
Synthesis and Kinetic Studies on the Photochemical Behavior of Polymeric Mesoions from Novel Methacrylic Monomers and of Mesoionic Copolymers with Liquid Crystalline Properties
作者:Alexander Theis、Helmut Ritter
DOI:10.1021/ma034700a
日期:2003.10.1
lengths was developed. Copolymers with methyl methacrylate and cholesteric monomers were prepared; the latter showed liquid crystalline properties. The rate constant of the photocyclization to the bis(β-lactame) structure of various spin-coated polymeric films was determined by irradiation with a HeCd laser (442 nm), whereby two different parameters controlling the rate constant could be found. It was shown
The present invention relates to novel compounds of Formula (I)
and their use in the treatment of respiratory diseases, including anti-inflammatory and allergic diseases such as chronic obstructive pulmonary disease (COPD), asthma, rhinitis (e.g. allergic rhinitis), atopic dermatitis or psoriasis.