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  • Title: Acid-promoted cascade cyclization to produce fused-polycyclic indole derivatives.
    Author: Yokosaka T, Nakayama H, Nemoto T, Hamada Y.
    Journal: Org Lett; 2013 Jun 21; 15(12):2978-81. PubMed ID: 23745602.
    Abstract:
    An acid-promoted novel cascade cyclization is described. Using 8 equiv of trifluoroacetic acid or a catalytic amount of Lewis acid as the promoter, structurally diverse polycyclic cyclopenta[b]indoles were obtained in moderate to excellent yield. This cascade process was extremely effective for the synthesis of 8-membered ring-fused cyclopenta[b]indole derivatives.
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