Synthesis of Dimethyl 4a,8a‐Methanophthalazine‐1,4‐dicarboxylate and Derivatives Diels‐Alder reaction with inversed electron demand of 1H‐cyclopropabenzol 1 with dimethyl 1,2,4,5‐tetrazine‐3,6‐dicarboxylate (2) yields dimethyl‐4a,8a‐methanophthalazine‐1,4‐dicarboxylate (3). The reactions of 3 with nucleophiles are also described.
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Neidlein et al. (1988) studied this question.
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