A tricyclic amide (2) related to 6-methylpretetramid (1), and several anthraquinones, including the natural products emodin (18) and physcion (19), have been synthesised in excellent yield through a base-catalysed ring closure reaction employing appropriately substituted 2-cyanomethyl-2′-methoxybenzophenones. This is a procedure of wide applicability for the synthesis of anthraquinones.
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Hassall et al. (1973) studied this question.
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