Pk. Mohakhud et al., SYNTHESIS OF SOME SUBSTITUTED 5,6-DIHYDRO-7H-BENZO[C]XANTHEN-7-ONE AND ITS AZA ANALOGS, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 35(9), 1996, pp. 904-910
Synthesis of 8,10, oxy-6-phenyl-5,6-dihydro-7H-benzo[c]xanthen-7-ones
20 and 22, -phenyl-5,6-dihydro-5-aza-7H-benzo[c]xanthen-7-one 25 and p
henyl-5,6,-dihydro-6-aza-7H-benzo[c]xanthen-7-one 29 has been accompli
shed by photocyclization while attempts towards artobiloxanthone 2 via
oxidative cyclization of appropriate 3-gamma-oxobutylffavone have not
succeeded.