V. Gevorgyan, L. G. Quan, Yoshinori Yamamoto
May 21, 1999
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Journal
Tetrahedron Letters
Abstract
o-Bromobenzaldehyde 1, in the presence of a palladium catalyst, smoothly underwent consecutive intermolecular carbopalladation with internal alkynes 2 and then intramolecular nucleophilic vinylpalladation of the aldehyde function to produce the indenol derivatives 4 in high yields. Further heating of 4 under more elevated temperature caused complete isomerization to the corresponding indanones 8. A mechanism for this nucleophilic vinylpalladation of aromatic aldehydes is proposed.