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Synthesis 2010(16): 2763-2766
DOI: 10.1055/s-0029-1218835
DOI: 10.1055/s-0029-1218835
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Regioselective Synthesis of Bromo-Substituted 3-Arylcoumarins
Weitere Informationen
Received
4 March 2010
Publikationsdatum:
25. Juni 2010 (online)
Publikationsverlauf
Publikationsdatum:
25. Juni 2010 (online)
Abstract
Regioselective syntheses of 3-arylcoumarins possessing a bromine substituent either on the 3-aryl ring, the coumarin moiety or on a lateral chain of a coumarin is reported. The regioselectivity is influenced by the substituents present in the substrates. Two different bromination methods are described and compared. Perkin condensation of 5-methylsalicylaldehyde and phenylacetic acid or para-methoxyphenylacetic acid affords the desired coumarins. Three different bromine substitution patterns are accessed starting from 5-methylsalicylaldehyde.
Key words
natural products - halogenation - bromine - regioselectivity - coumarins
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