epi-Inositol was synthesized in six steps in 40% overall yield from a bacterial bromobenzene metabolite. The chemoenzymatic route involved toluene dioxygenase oxidation, substrate-directed catalytic osmylation, m-CPBA epoxidation, radical debromination, and Amberlite-catalized hydrolysis. The route described is amenable to scaleup and could allow access to cis-inositol, and deoxy derivatives of epi-inositol. (C) 2004 Elsevier Ltd. All rights reserved.
Enantiopure arene dioxides: chemoenzymatic synthesis and application in the production of trans-3,4-dihydrodiols
作者:Derek R. Boyd、Narain D. Sharma、Colin R. O’Dowd、Francis Hempenstall
DOI:10.1039/b006837n
日期:——
Enantiopure syn- and anti-arene dioxides are
synthesised from cis-dihydrodiol metabolites;
anti-benzene dioxides are reduced to enantiopure
trans-3,4-dihydrodiols while syn-benzene dioxides
racemise thermally via 1,4-dioxocins.
The preparation and dihydroxylation (OsO4) of a series of conformationally constrained allylicalcohols is described. By using dichloromethane as solvent, the selectivity that favours the anti triol is substantially reduced by hydrogen-bonding effects. This principle is applied to the stereoselective synthesis of syn tetraols from the oxidation of (1S,2S)-1,2-dihydroxy-3-bromo-3,5-cyclohexadiene.