Enantioselective toluene dioxygenase catalysed di- and tri-hydroxylation of monosubstituted benzenes
作者:Derek R. Boyd、Narain D. Sharma、Nigel I. Bowers、John Duffy、John S. Harrison、Howard Dalton
DOI:10.1039/b000753f
日期:——
Asymmetric cis-dihydroxylation to yield diols 2A–2G and sequential benzylic monohydroxylation–cis-dihydroxylation to yield triols 4A–4G (trihydroxylation), occurred during biotransformation of a series of monosubstituted alkylbenzene substrates 1A–1G using toluene dioxygenase, a biocatalyst present in Pseudomonasputida UV4. Dioxygenase-catalysed cis-dihydroxylation of the R and S benzylic alcohol
UV4, occurred exclusively at the alkyl aryl sulfur centre to yield the alkyl arylsulfoxides 2 and 5 respectively. These sulfoxides, accompanied by the dialkyl sulfoxides 3 and 6, were also obtained from naphthalene dioxygenase (NDO)-catalysed sulfoxidation of thioacetals 1 and 4 using intact cells of P. putida NCIMB 8859. Enzymatic oxidation of methyl benzyl sulfide 7, 2-phenyl-1,3-dithiane 19, and