Expedient synthesis of xanthones and multi-functionalized chromones from 1,1-diacyl cyclopropanes
We report the rapid synthesis of various cycloheptane-fused chromones and an oxepine fused flavone in 5 steps from the corresponding 2-hydroxy acetophenone. Furthermore, we describe the synthesis of xanthones, in moderate to good yield, from 2,3-disubstit
French, Sarah A.,Clark, Mitchell R.,Smith, Robert J.,Brind, Thomasin,Hawkins, Bill C.
p. 5340 - 5350
(2018/04/19)
A new synthesis of 5-arylbenzo[c]xanthones from photoinduced electrocyclisation and oxidation of (E)-3-styrylflavones
A new synthetic route to 5-arylbenzo[c]xanthones is -established. This was accomplished by use the Heck reaction of 3-bromoflavones with styrene derivatives, leading to (E)-3-styrylflavones with total diastereoselectivity. This transformation was greatly improved under microwave irradiation. The one-pot, photoinduced electrocyclisation of (E)-3-styrylflavones and further in situ oxidation of the cycloadduct leads to 5-arylbenzo[c]xan-thones. Georg Thieme Verlag Stuttgart · New York.
Rocha, Djenisa H. A.,Pinto, Diana C. G. A.,Silva, Artur M. S.,Patonay, Tamás,Cavaleiro, José A. S.
scheme or table
p. 559 - 564
(2012/04/04)
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