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Efficient approaches to the synthesis of methyl esters and aspartyl amides of so-called ring A -benzoporphyrin derivatives from rhodoporphyrin XV dimethyl ester 10 and 3-vinylphylloerythrin methyl ester 22 are reported. The benzo-rings in the products are obtained by way of Diels-Alder [4+2] cyclizations which employ a dieneophile and the vinyl and 2,3-double bonds in the starting materials as...
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