Toluene dioxygenase-catalyzed dihydroxylation, in the carbocyclic rings of quinoline, 2-chloroquinoline, 2-methoxyquinoline, and 3-bromoquinoline, was found to yield the corresponding enantiopure cis-5,6- and -7,8-dihy dro diol metabolites using whole cells of Pseudomonas putida UV4. cis-Dihydroxylation at the 3,4-bond of 2-chloroquino line, 2-methoxyquinoline, and 2-quinolone was also found to yield the heterocyclic cis-dihydrodiol metabolite, (+)-cis-(3S,4S)-3,4-dihydroxy-3,4-dihydro-2-quinolone. Heterocyclic cis-dihydrodiol metabolites, resulting from dihydroxylation at the 5,6- and 3,4-bonds of 1-methyl 2-pyridone, were isolated from bacteria containing toluene, naphthalene, and biphenyl dioxygenases. The enantiomeric excess (ee) values (>98%) and the absolute configurations of the carbocyclic cis-dihydrodiol metabolites of quinoline substrates (benzylic R) and of the heterocyclic cis-diols from quinoline, 2-quinolone, and 2-pyridone substrates (allylic S) were found to be in accord with earlier models for dioxygenase-catalyzed cis-dihydroxylation of carbocyclic arenes. Evidence favouring the dioxygenase-catalyzed cis-dihydroxylation of pyridine-ring systems is presented.Key words: dioxygenases; cis-dihydroxylation, pyridines, 2-pyridones, absolute configurations.
甲苯双氧酶催化的二羟基化,在喹啉、2-氯喹啉、2-甲氧基喹啉和3-溴喹啉的碳环上,发现利用假单胞菌UV4的全细胞产生相应的对映纯的顺式-5,6-和-7,8-二氢二醇代谢产物。在2-氯喹啉、2-甲氧基喹啉和2-喹啉的3,4-键上也发现了异环顺式二氢二醇代谢产物,(+)-顺式-(3S,4S)-3,4-二羟基-3,4-二氢-2-喹啉。从含有甲苯、萘和联苯双氧酶的细菌中分离出了由1-甲基-2-吡啶酮的5,6-和3,4-键的二羟基化产生的异环顺式二氢二醇代谢产物。喹啉底物的碳环顺式二氢二醇代谢产物(苄基R)以及来自喹啉、2-喹啉和2-吡啶酮底物的异环顺二醇(烯基S)的对映过量值(ee值>98%)和绝对构型与早期模型相符,用于描述双氧酶催化的碳环芳烃顺式二羟基化。提供支持双氧酶催化的吡啶环系统顺式二羟基化的证据。关键词:双氧酶;顺式二羟基化,吡啶,2-吡啶酮,绝对构型。