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(searched for: (10.5155/eurjchem.2.1.117-119.201))
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Aamer Saeed
European Journal of Chemistry, Volume 2, pp 117-119; doi:10.5155/eurjchem.2.1.117-119.201

Abstract:
The synthesis of 8-hydroxy-6-methoxy-3-pentyl-1H-isochromen-1-one (1) isolated from the stem and root bark extracts of Tessmannia densiflora has been described. The reaction of 3,5-dimethoxyhomophthalic anhydride (2) with hexanoyl chloride in the presence of 1,1,3,3-tetramethylguanidine and triethylamine afforded 6,8-dimethoxy-3-pentylisocoumarin (3). Regioselective demethylation of the latter using anhydrous aluminum chloride furnished the title isocoumarin (1).
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