Visible‐Light Catalytic Photooxygenation of Monoterpene Indole Alkaloids: Access to Spirooxindole‐1,3‐oxazines
作者:Thorsten von Drathen、Frank Hoffmann、Malte Brasholz
DOI:10.1002/chem.201801882
日期:2018.7.17
Few natural oxindolealkaloids possess an exceptional spiro‐[(1,3)oxazinan‐3,6′‐oxindole] core structure, which results from an unusual oxidative indole rearrangement. The Rauvolfia alkaloid reserpine can be converted into the spirooxindole‐1,3‐oxazines dioxyreserpine and trioxyreserpine through efficient visible‐light catalytic photooxygenation with anthraquinone photocatalysts. A mechanistic investigation