A Biomimetic Approach to Dihydrobenzofuran Synthesis
作者:John W. Benbow、Reeti Katoch-Rouse
DOI:10.1021/jo000696e
日期:2001.7.1
precursors 10 is presented. The putative oxoniumion intermediate 17 formed by an intramolecular hydroxyl cyclization followed by dehydration is reduced in situ by an added dihydroquinone source. Good to excellent yields of cyclized products are realized in all cases except for highly electron deficient systems, and these suffer reduction prior to oxoniumion formation. All products are monomeric and