Enantiopurity and absolute configuration determination of arene<i>cis</i>-dihydrodiol metabolites and derivatives using chiral boronic acids
作者:Derek R. Boyd、Narain D. Sharma、Peter A. Goodrich、John F. Malone、Gareth McConville、John S. Harrison、Paul J. Stevenson、Christopher C.R. Allen
DOI:10.1002/chir.22764
日期:2018.1
cis‐dihydrodiol, cyclohex‐2‐en‐1‐one cis‐diol, heteroarene cis/trans‐2,3‐diol, and catechol metabolites in estimating their ee values, and 2) new chiral phenylboronic acids, 2‐[1‐methoxy‐2,2‐dimethylpropyl]phenyl boronic acid (MDPBA) and 2‐[1‐methoxy‐1‐phenylmethyl]phenyl boronic acid (MPPBA) and their advantages over MEPBA, as reagents for stereochemical analysis of arene and alkene cis‐diol metabolites, are presented
Regioselectivity and stereoselectivity of dioxygenase catalysed cis-dihydroxylation of mono- and tri-cyclic azaarene substrates
作者:Derek R. Boyd、Narain D. Sharma、Gerard P. Coen、Francis Hempenstall、Vera Ljubez、John F. Malone、Christopher C. R. Allen、John T. G. Hamilton
DOI:10.1039/b810235j
日期:——
cis-Dihydrodiol
metabolites were obtained from dioxygenase-catalysed asymmetric dihydroxylations of five monocyclic (azabiphenyl) and four tricyclic (azaphenanthrene) azaarene substrates. Enantiopurity values and absolute configuration assignments were determined using a combination of stereochemical correlation, X-ray crystallography and spectroscopy methods. The degree of regioselectivity found during cis-dihydroxylation of monocyclic azaarenes (2,3 bond >> 3,4 bond) and of tricyclic azaarenes (bay region > non-bay region bonds) was dependent on the type of dioxygenase used. The cis-dihydrodiol metabolite from an azaarene (3-phenylpyridine) was utilised in the chemoenzymatic synthesis of the corresponding trans-dihydrodiol.