A Novel Oxidative Decarboxylation ofα-Substitutedα-Hydroxy Acids by a Functionalized Oxidation-active Flavin Mimic in the Presence of a Metal Ion int-Butyl Alcohol
Oxidation of α-hydroxy acids by an oxidation-active flavin mimic bearing a bipyridin-6-ylmethyl moiety in the presence of Zn<sup>2+</sup>and a base in tert-butyl alcohol
A benzo-dipteridine (BDP) having a bipyridin-6-ylmethyl moiety oxidizes α-hydroxy acids to give α-keto acids in the presence of Zn2+ and Et3N in ButOH, whereas a BDP bearing a bipyridin-5-ylmethyl moiety is unable to oxidize them under the same conditions; this is the first example of a D-lactate dehydrogenase model.
Oxidation-Active Flavin Models: Oxidation of α-Hydroxy Acids by Benzo-dipteridine Bearing Metal-Binding Site in the Presence of Divalent Metal Ion and Base in Organic Solvents
effect for deuterated mandelic acids (k(H)/k(D) = 2.1-3.7) and the Hammett plots for substitutedmandelic acids (V-shaped plots). In the reaction of alpha-substituted alpha-hydroxy acids such as alpha-methyl mandelic and benzylic acids with 4, novel oxidative decarboxylation was found to take place, giving acetophenone and benzophenone, respectively. The oxidation mechanism for mandelic acid was proposed