A stereospecific 7-step synthesis of (-)-indolactam V1 from tryptophan methyl ester is described. The key steps are the photocyclisation of the dichloroamide 6 to give the isomeric 7-hydroxy-7-isopropylpyrrolo[4,3,2-fg]benzazocines 16 + 18 and the nitrene-mediated ring expansion of the derived azide 5 to give the 9-membered imine 4. The synthesis is completed by stereoselective reduction of the imine bond and N-methylation.
|Original language||English (US)|
|Number of pages||8|
|Journal||Journal of the Chemical Society, Perkin Transactions 1|
|State||Published - 1992|
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