Journal
ORGANIC LETTERS
Volume 5, Issue 3, Pages 333-335Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol0202417
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Nominine (1) and aspernomine (2) are two biologically important indole diterpenoids that arise from a common digeranylindole precursor. The skeletal relationship of these two natural products was not heretofore understood. We have observed a novel rearrangement of 2-(2-bromophenyl)-3-(3-butenyl)-3H-indol-3-ol (5) to 7, which contains the uncommon 1,4,5,6-tetrahydro-2,6-methano-1-benzazocin-3(2H)-one ring system, under acidic conditions. This rearrangement suggests that aspernomine (2) may arise biosynthetically from nominine (1).
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