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Synthesis 2010(21): 3715-3723
DOI: 10.1055/s-0030-1258214
DOI: 10.1055/s-0030-1258214
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Tris(pentafluorophenyl)borane-Catalyzed Alkylation of 1,3-Dicarbonyl Compounds with Benzylic Alcohols: Access to Oxygenated Heterocycles
Further Information
Received
29 June 2010
Publication Date:
13 August 2010 (online)
Publication History
Publication Date:
13 August 2010 (online)
Abstract
Tris(pentafluorophenyl)borane has found to be an effective catalyst for the alkylation of 1,3-dicarbonyl compounds using benzylic alcohols as alkylating agents. Various 1,3-dicarbonyl compounds reacted cleanly with different benzylic alcohols to provide the corresponding monoalkylated products in good yield. In addition tris(pentafluorophenyl)borane efficiently promoted the C3 alkylation of 4-hydroxycoumarins. Further, several oxygenated heterocycles such as furans, 4H-chromenes, and furanocoumarins have been prepared using the described methodology as the key step.
Key words
tris(pentafluorophenyl)borane - 1,3-dicarbonyl compound - benzylic alcohol - alkylation - heterocycle
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