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From A to B: The decalin moiety of azadirachtin, which includes the fully functionalized AB ring system (see picture), was synthesized stereoselectively in only 23 steps. Key steps include an intramolecular Diels–Alder reaction, a decarboxylation, a Claisen rearrangement, and finally a tandem radical cyclization.
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Watanabe et al. (2007) studied this question.
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