In analogy to earlier work, the acid-catalysed photocyclisation of 3-[2-(dioxolan-2-yl)benzyl]chromone (II; XX = O·CH2·CH2·O) to give 6,6-ethylenedioxy-5aα6,11,11aα-tetrahydro-12H-benzo[b]xanthen-12-one (III) and its trans-(5aαH,11aβH)isomer (IV) has been effected. It is suggested that this photocyclisation process will be of general synthetic utility.
D. H. R. Barton, P. D. Magnus and J. I. Okogun, J. Chem. Soc., Perkin Trans. 1, 1972, 1103 DOI: 10.1039/P19720001103
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