Toward the Macrocidins: Macrocyclization via Williamson Etherification of a Phenolate

[摘要]：The synthesis of macrocyclic 3-acyltetramic acids which are immediate precursors of the fungal herbicide macro-cidin A (1) is reported. The crucial closure of the macrocycle was achieved in excellent yield by an unprecedented Williamson etherification of an omega-bromo phenolate generated in situ by a Pd-mediated O-deallylation.

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