Monoalkylation of dihydroxycoumarins via Mitsunobu dehydroalkylation under high intensity ultrasound. The synthesis of ferujol
摘要:
Monoalkylation of natural dihydroxycoumarins was carried out by Mitsunobu dehydroalkylation under sonochemical conditions. Aesculetin (6,7-dihydroxycoumarin) was selectively alkylated in good yield with prenyl alcohols at position 7, as clearly shown by NOESY experiments; though less selectively, position 7 was also the most reactive in daphnetin (7,8-dihydroxycoumarin). The synthesis of the phytoestrogen ferujol is also reported for the first time. (C) 2003 Elsevier Ltd. All rights reserved.
Monoalkylation of natural dihydroxycoumarins was carried out by Mitsunobu dehydroalkylation under sonochemical conditions. Aesculetin (6,7-dihydroxycoumarin) was selectively alkylated in good yield with prenyl alcohols at position 7, as clearly shown by NOESY experiments; though less selectively, position 7 was also the most reactive in daphnetin (7,8-dihydroxycoumarin). The synthesis of the phytoestrogen ferujol is also reported for the first time. (C) 2003 Elsevier Ltd. All rights reserved.