期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 40, 页码 10253-10259出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201801882
关键词
alkaloids; photochemistry; reaction mechanisms; rearrangement; spiro compounds
资金
- Deutsche Forschungsgemeinschaft (DFG) [BR3748/2-1]
Few natural oxindole alkaloids 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 sheds new light on the photooxidative rearrangement of reserpine and related monoterpene indole alkaloids, and the spirooxindole-1,3-oxazine products can be valorized by reductive ring opening, to obtain cis-decahydroisoquinolines as new enantiopure synthetic building blocks, as demonstrated for dioxyreserpine.
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