D ring intermediates for the synthesis of camptothecin and campt

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

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546302, C07D21364

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052645797

ABSTRACT:
Processes for making compounds of Formulae XIV, XV, and XVII ##STR1## wherein R.sub.6 is lower alkyl, R.sub.7 is lower alkyl, R is lower alkyl, Y is H, F or Cl, R.sub.8 is a compound of Formula ##STR2## wherein n is 1, 2, or 3, R.sub.11 is C.sub.1 -C.sub.4 alkyl and R.sub.12 is the same as R.sub.11, or R.sub.11 and R.sub.12 together form cyclopentane or cyclohexane, and R.sub.13 is:

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