Phenanthride synthesis

Imidazolidines may also act as ortho directing groups the lithiadon of l,3-dimethyl-2-phenylimidazo-lidine followed by addition to benzophenone proceeds in 63% yield. Carbazole aminals can be metal-ated ortho to the nitrogen, while benzo[a]carbazole may be dili iated at nitrogen and the 1-position. A 2-amino group of a biphenyl directs lithiation to the 2 -position of the other ring in a novel synthesis of a phenanthride. ... 

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