Pd-Catalyzed Site-Selective Mono-allylic Substitution and Bis-arylation by Directed Allylic C–H Activation: Synthesis of <i>anti</i>-γ-(Aryl,Styryl)-β-hydroxy Acids and Highly Substituted Tetrahydrofurans
作者:Jothi L. Nallasivam、Rodney A. Fernandes
DOI:10.1021/jacs.6b06438
日期:2016.10.12
An efficient palladium-catalyzed site-selective arylation of γ-vinyl-γ-lactone by aryl boronic acid has been developed. γ-Vinyl-γ-lactone 1a has been contemplated as allyl electrophile donor for allylicarylation via π-allyl palladium intermediate using 1.5 equiv of aryl boronic acid 2. Using 3.0 equiv of the latter resulted in mono-arylation by allylic substitution and subsequent site-selective second
Characterization of an epoxide hydrolase from the Florida red tide dinoflagellate, Karenia brevis
作者:Pengfei Sun、Cristian Leeson、Xiaoduo Zhi、Fenfei Leng、Richard H. Pierce、Michael S. Henry、Kathleen S. Rein
DOI:10.1016/j.phytochem.2015.11.002
日期:2016.2
hydrolases (EH, EC 3.3.2.3) have been proposed to be keyenzymes in the biosynthesis of polyether (PE) ladder compounds such as the brevetoxins which are produced by the dinoflagellate Karenia brevis. These enzymes have the potential to catalyze kinetically disfavored endo-tet cyclization reactions. Data mining of K. brevis transcriptome libraries revealed two classes of epoxide hydrolases: microsomal and