Biomimetic Aromatic Hydroxylation of Selected Diphenylmethane Derivatives
作者:Luela Fröhlich、Birgit Pietzyk、B. Göber
DOI:10.1002/ardp.19953280419
日期:——
Many oxidationsystemsusing iron or manganeseporphyrins as catalysts and various oxygen atom donors have been reported to mimic cytochrome P‐450‐dependent monooxygenases1–3). Such systems are very efficient for epoxidation of alkenes and reasonably for alkane hydroxylation. Few authors also reported about the activity to hydroxylate aromatic rings. In these cases low yields were found for hydroxylation
Photocatalytic Carbinol Cation/Anion Umpolung: Direct Addition of Aromatic Aldehydes and Ketones to Carbon Dioxide
作者:Shintaro Okumura、Yasuhiro Uozumi
DOI:10.1021/acs.orglett.1c02592
日期:2021.9.17
We have developed a new photocatalytic umpolung reaction of carbonyl compounds to generate anionic carbinol synthons. Aromaticaldehydes or ketones reacted with carbon dioxide in the presence of an iridium photocatalyst and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzimidazole (DMBI) as a reductant under visible-light irradiation to furnish the corresponding α-hydroxycarboxylic acids through nucleophilic