A new convergent strategy for assembling 6/6- and 6/7-fused ether ring systems was developed. The key features in our method include Ag+-promoted facile formation of chemically labile enol ether from O,S-acetal and addition of an acyl radical to unactivated enol ether to cyclize a six- or seven-membered ether ring. [reaction: see text]
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/17134276