Cycloalkenyl Halide Substitution Reactions of Enantiopure Arene cis-Tetrahydrodiols with Boron, Nitrogen and Phosphorus Nucleophiles
作者:D. R. Boyd、N. D. Sharma、M. Kaik、M. Bell、M. V. Berberian、P. B. A. McIntyre、B. Kelly、C. Hardacre、P. J. Stevenson、C. C. R. Allen
DOI:10.1002/adsc.201100273
日期:2011.9
Enantiopurearene cis‐tetrahydrodiols of bromobenzene and iodobenzene have been obtained in good yields, from chemoselective hydrogenation (rhodium‐graphite) of the corresponding cis‐dihydrodiol metabolites. Palladium‐catalysed substitution of the halogen, by hydrogen, boron, nitrogen and phosphorusnucleophiles, in the acetonide derivatives, has yielded highly functionalised products for application
Chemoenzymatic synthesis of arene oxides and trans-dihydrodiols from cis-dihydrodiols of monosubstituted benzenes
作者:Derek R. Boyd、Narain D. Sharma、Howard Dalton、David A. Clarke
DOI:10.1039/cc9960000045
日期:——
cis-Dihydrodiol bacterial metabolites of monosubstituted benzenes are used in the chemoenzymatic synthesis of the corresponding arene oxide and trans-dihydrodiol mammalian metabolites.
Structure, stereochemistry and synthesis of enantiopure cyclohexenone cis-diol bacterial metabolites derived from phenols
作者:Derek R. Boyd、Narain D. Sharma、John F. Malone、Peter B. A. McIntyre、Paul J. Stevenson、Christopher C. R. Allen、Marcin Kwit、Jacek Gawronski
DOI:10.1039/c2ob25079a
日期:——
Biotransformation of 3-substituted and 2,5-disubstituted phenols, using whole cells of P. putida UV4, yielded cyclohexenone cis-diols as single enantiomers; their structures and absolute configurations have been determined by NMR and ECD spectroscopy, X-ray crystallography, and stereochemical correlation involving a four step chemoenzymatic synthesis from the corresponding cis-dihydrodiol metabolites
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.
A chemoenzymatic total synthesis of the phytotoxic undecenolide (−)-cladospolide A
作者:Martin G. Banwell、David T. J. Loong
DOI:10.1039/b401829j
日期:——
An eleven-step synthesis of the title compound (1) from biocatalytically-derived and enantiomerically pure âbuilding blocksâ alcohol (R)-(â)-9 and ester 13 is described. Attempts to construct the twelve-membered lactone ring of cladospolide A in a direct manner by using a ring-closing metathesis (RCM) reaction failed. However, a ten-membered lactone, 19, could be constructed by such means and this was then subject to a two-carbon homologation sequence involving, inter alia, WadsworthâHornerâEmmons and Yamaguchi lactonisation reactions in the closing stages of the synthesis. The impact of substituent stereochemistries and protecting groups on the RCM reaction leading to various ten-membered lactones is also described.