NUCLEOPHILIC REACTIONS OF 9-ISOPROPYL-2,4-DIMETHOXY-7,12-DIMETHYL-3-(PHENYLSULFONYL)BENZO[a]HEPTAL ENE WITH LITHIUM DIALKYLAMIDES

[摘要]：Treatment of the title compounds with lithium piperidinide in THF at -5 degrees C leads to an exchange of the two methoxy groups by piperidino substituents (Scheme 2). On the other hand, lithium diisopropylamide (LDA) in THF at -5 degrees C induces the formation heptaleno-annulated dibenzothiophenes.

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