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Miscellaneous approaches to the synthesis of naturally occurring TBD antibiotics: (a) Danishefsky’s intramolecular lactonic Claisen rearrangement enabled total synthesis of (−)-equisetin (37);54 (b) Barriault’s oxy-Cope/ene/Claisen rearrangement approach to the TBD framework of (−)-tetrodecamycin (59);58 (c) Tatsuta’s SmI2-mediated radical cyclization process to (−)-tetrodecamycin (59).59
