Treatment of oxindole bromides (4) and (6) with t-butyl-lithium followed by reduction with lithium aluminium hydride gave the cis-4a-methylhexahydrocarbazoles (11) and (13).
C. McCarthy and K. Jones, J. Chem. Soc., Chem. Commun., 1989, 1717 DOI: 10.1039/C39890001717
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