Natural product inspired asymmetric catalysis resulted from an effort directed toward colombiasin A and related complex targets. The discovery of highly selective quinone Diels–Alder reactions catalyzed by the new, monomeric [(Schiff base)CrIII] complex 1 was a requisite step in the synthetic endeavor (see scheme; TES=triethylsilyl, DBU=1,8-diazabicyclo[5.4.0]undec-7-ene).
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Jarvo et al. (2005) studied this question.
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