Facile generation and trapping of .alpha.-oxo-o-quinodimethanes: synthesis of 3-aryl-3,4-dihydroisocoumarins and protoberberines
作者:Satinder V. Kessar、Paramjit Singh、Rahul Vohra、Nachhattar Pal Kaur、D. Venugopal
DOI:10.1021/jo00051a009
日期:1992.12
Fluorodesilylation of o-((trimethylsilyl)methyl)benzoyl derivatives 5 in the presence of aromatic aldehydes and alkyl fumarates gives 3-aryl-3,4-dihydroisocoumarins 6 and alpha-tetralones 10, respectively. Reaction of 5 with 3,4-dihydroisoquinolinium salts 19 leads to 8-oxoberbines 21. Using this procedure, racemic hydrangenol, phyllodulcin, tetrahydropalmatine (22a), and canadine (22b) have been synthesized.