A Mechanistic Study of the Dihydroflavin Reductive Cleavage of the Dihydroflavin–Tetrahydronaphthalene Epoxide Adducts
作者:Yong T. Lee、Jed F. Fisher
DOI:10.1006/bioo.2000.1171
日期:2000.6
covalent flavin-epoxide adduct formation) the products having a methylene group at the benzylic position. The reduction product yield was proportional to the yield of the N(5) flavin-epoxide adduct intermediate, and the rate of the reaction was proportional to the dihydroflavin concentration. These observations are consistent with these reduction products resulting from bimolecular reaction between the
二氢黄素是容易的还原剂和有效的亲核试剂。通过与四氢萘环氧化物形成共价黄素加合物的速率测量的二氢黄素亲核反应性与硫醇根阴离子的亲核反应性相当(YT Lee和JF Fisher(1993)J. Org。Chem。58,3712)。在这些反应中,在被二氢黄素亲核裂解环氧化物之后,出现了与这些环氧化物的形式氢化物还原产物(在苄基碳上)相对应的产物。因此,(+/-)-1a,2,3,7b-四氢-(1aalpha,2alpha,3beta,7balpha)-萘[1,2-b]环氧乙烷-2,3-二醇的反应(1),( +/-)-1a,2,3,7b-四氢-(1aalpha,2beta,3alpha,7balpha)-萘[1,2-b]环氧乙烷-2、3-二醇(2)和(+/-)在9:1(v / v)的Tris缓冲液-二恶烷水溶液中的-1a,2,3,7b-四氢-(1aalpha,7balpha)-萘[1,2-b]环氧乙