Application of the photocyclisation procedure described in Part V to ring A substituted compounds is discussed. The photocyclisation product methyl 12-ethylenedioxy-6aα,7,12,12aα-tetrahydro-9,11-dimethoxy-6-oxo-1-phenyl-6H-naphthaceno[1,12-bc]furan-10-carboxylate (XII; R1= Me, R2= OMe, X = Y = O) has been converted into 6-methylpretetramid.
D. H. R. Barton, P. D. Magnus and T. Hase, J. Chem. Soc. C, 1971, 2215 DOI: 10.1039/J39710002215
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