A three component condensation of aromatic amine, aldehyde, and cyclopentadiene with subsequent N trifluoroacetylation leads to 4 and 4,8 substituted N trifluoroacetyl 3a,4,5,9b tetrahydro 3H cyclopenta[c]quinolines. Ozonation of the double bond in the latter produced the corresponding isomeric stable ozonides having (1R*,4S*,5aR*,6S*,11bR*) configuration and differing in inversion at the carboxamide nitrogen atom.
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