Diastereoselection in the Formation of Contiguous Quaternary Carbon Stereocenters by the Intramolecular Heck Reaction
作者:Larry E. Overman、Donald A. Watson
DOI:10.1021/jo0523363
日期:2006.3.31
diastereoselection in the second ring closure of the highly diastereoselective double Heckcyclization of cyclohexenes 1 and 3 that form contiguous quaternarystereocenters. Seven model substrates were synthesized and cyclized to examine the structural features responsible for imparting diastereoselection in the second intramolecular Heckreaction. These studies demonstrate that stereoselection in the formation of the
Chemoenzymatic synthesis of monocyclic arene oxides and arene hydrates from substituted benzene substrates
作者:Derek R. Boyd、Narain D. Sharma、Vera Ljubez、Peter K. M. McGeehin、Paul J. Stevenson、Marine Blain、Christopher C. R. Allen
DOI:10.1039/c3ob40166a
日期:——
Reduction of a substituted areneoxide to yield a racemicarene hydrate was observed. Arene hydrates have also been synthesised, in enantiopure form, from the corresponding dihydroarene oxide or trans-bromoacetate precursors. Biotransformation of one arene hydrate enantiomer resulted in a toluene-dioxygenase catalysed cis-dihydroxylation to yield a benzene cis-triol metabolite.