Chemoenzymatic synthesis of the trans-dihydrodiol isomers of monosubstituted benzenes viaanti-benzene dioxides
作者:Derek R. Boyd、Narain D. Sharma、Nuria M. Llamas、Colin R. O'Dowd、Christopher C. R. Allen
DOI:10.1039/b603928f
日期:——
dioxygenase-catalysed cis-dihydroxylation of monosubstitutedbenzene substrates, have been used as synthetic precursors of the corresponding trans-3,4-dihydrodiols. The six-step chemoenzymatic route from cis-dihydrodiol precursors, involving acetonide, tetraol, dibromodiacetate and diepoxide intermediates, and substitution of vinyl bromide and iodide atoms, has been used in the synthesis of ten trans-dihydrododiol derivatives
Enantioselective bacterial biotransformation routes to cis-diol metabolites of monosubstituted benzenes, naphthalene and benzocycloalkenes of either absolute configuration
作者:Christopher C. R. Allen、Derek R. Boyd、Howard Dalton、Narain D. Sharma、Ian Brannigan、Nuala A. Kerley、Gary N. Sheldrake、Stephen C. Taylor
DOI:10.1039/c39950000117
日期:——
Enzyme-catalysed kinetic resolution and asymmetric dihydroxylation routes to enantiopure cis-diol metabolites of arenes and benzocycloalkenes of either absolute configuration have been developed using appropriate strains of the bacterium Pseudomonas putida.
syn-Benzene dioxides: chemoenzymatic synthesis from 2,3-cis-dihydrodiol derivatives of monosubstituted benzenes and their application in the synthesis of regioisomeric 1,2- and 3,4-cis-dihydrodiols and 1,4-dioxocins
作者:Derek R. Boyd、Narain D. Sharma、Nuria M. Llamas、Colin R. O'Dowd、Christopher C. R. Allen
DOI:10.1039/b704584k
日期:——
corresponding 1,4-dioxocins. The syn-benzene dioxide-1,4-dioxocin valence tautomeric equilibrium ratio was found to be dependent on the substituent position. The methodology has also been applied to the synthesis of both enantiomers of the 1,2-(ipso)- and 3,4-cis-dihydrodiols of toluene. This chemoenzymatic approach thus makes available, for the first time, all three possible cis-dihydrodiol regioisomers of
Enzyme-Catalysed Synthesis and Absolute Configuration Assignments ofcis-Dihydrodiol Metabolites from 1,4-Disubstituted Benzenes
作者:Derek R. Boyd、Narain D. Sharma、Gerard P. Coen、Peter J. Gray、John F. Malone、Jacek Gawronski
DOI:10.1002/chem.200601852
日期:2007.7.6
using stereochemical correlation and X-ray crystallography and the remainder have been tentatively assigned using NMR spectroscopic methods but finally confirmed by circulardichroism (CD) spectroscopy. These configurational assignments support and extend the validity of an empirical model, previously used to predict the preferred stereochemistry of TDO-catalysed cis-dihydroxylation of ten 1,4-disubstituted
From Toluene to Taxol<sup>TM</sup>: Chemoenzymatic and Enantiodivergent Routes to the AB-Ring Systems of Taxoids and <i>ent</i>-Taxoids
作者:Martin G. Banwell、Penny Darmos、Malcolm D. McLeod、David C. R. Hockless
DOI:10.1055/s-1998-1801
日期:1998.8
The cis-1,2-dihydrocatechol 2 has been converted, via reaction sequences including Diels-Alder cycloaddition and anionic oxy-Cope rearrangement steps, into the enantiopure bicyclo[5.3.1]undecanes 20 and 33 which correspond to the AB-ring systems of ent-taxoids and taxoids, respectively.
顺式-1,2-二氢邻苯二酚 2 通过包括 Diels-Alder 环加成和阴离子氧-科普重排步骤在内的反应序列,被转化为对映体纯双环[5.3.1]十一烷 20 和 33,它们分别对应于内类脂和类脂的 AB 环系统。