@article {Gimisis1993a,
	title = {{Synthesis of methylene-bridged polycyclic aromatic hydrocarbons: an efficient, double Friedel-Crafts cyclization approach to 11H-benz[bc]aceanthrylene}},
	journal = {J. Org. Chem.},
	volume = {58},
	number = {21},
	year = {1993},
	month = {oct},
	pages = {5858{\textendash}5861},
	abstract = {A five-step synthesis of 3-methylcholanthrene (1) has been achieved starting from 5-methylhomophthalic anhydride and N,N-diethyl-1-naphthamide in 55{\%} overall yield. Treatment of a solution of the preformed lithium enolate of 5-methylhomophthalic anhydride (3) with an equimolar solution of 2-lithio-1-naphthamide (4), followed by acid hydrolysis, provides cleanly the spirobislactone 5 in 80{\%} overall yield. In addition, the synthesis features a unique, highly selective double Friedel-Crafts cyclization of the aryl diacid 2 with PPA to give rise, after acetylation, to keto acetate 6. {\textcopyright} 1993 America Chemical Society.},
	issn = {0022-3263},
	doi = {10.1021/jo00073a058},
	url = {http://pubs.acs.org/doi/abs/10.1021/jo00073a058},
	author = {Gimisis, Thanasis and Kampf, Jeff W. and Koreeda, Masato}
}
