Add time:08/16/2019         Source:sciencedirect.com

A divergent, asymmetric method for the synthesis of pyranonaphthoquinones is reported. The synthetic strategy applies a Staunton–Weinreb annulation between substituted ortho-toluates and the (R)-pyran-2-one 7 to construct the key naphthopyranone intermediates. Stereoselective introduction of either a methyl or propyl C5 alkyl substituent by use of Grignard addition/silane-mediated reduction and a sequence of oxidations gave a series of pyranonaphthoquinones including kalafungin 1, 5-epi-9-methoxykalafungin 34 and 5-epi-frenolicin B 24.

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