2-, 3-, 4-, and 6-Methyl- and 6-methoxycyclopenta[a]phenanthren-17-ones were prepared from appropriately substituted naphthalenes or tetralones, through Stobbe condensation of the corresponding 1,2,3,4-tetrahydrophenanthren-1-ones. The synthesis of ketones labelled with 14C in ring D and in the 11-methyl group is also described.
M. M. Coombs, S. B. Jaitly and F. E. H. Crawley, J. Chem. Soc. C, 1970, 1266 DOI: 10.1039/J39700001266
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