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The Diels-Alder adduct 4 of an N-protected pyrrole with dimethyl acetylenedicarboxylate can be transformed to 5 and 6 by short sequences which differenciate the two ester groups; these compounds are interesting starting materials for the synthesis of potential thromboxane A2 antagonists as well as other bio-active compounds.
Our first attempts to realize an enzymatic mono hydrolysis of 4 were unsuccessful.
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