Monatshefte fur Chemie p. 641 - 650 (1997)
Update date:2022-07-30
Topics:
Majumdar
Jana
Ghosh
Saha
At elevated temperatures, the 3-(meta-substituted aryloxymethyl) coumarins 3a-e and 3g-k undergo sigmatropic rearrangements to give the hydroxylated 3-benzylcoumarins 4a-e and 4g-k. Upon methylation and subsequent oxidation with N-bromo succinimide, the 3-(chlorosubstituted benzyl) coumarins 4a, 4m and 4n afford 3-(chlorosubstituted benzoyl) coumarins 8a, 8m, and 8n.
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