The hetero Diels-Alder adducts 6a-d derived from azodibenzoyl and cyclic dienes were oxidized by ruthenium tetroxide and transformed into meso-diaminodicarboxylic acids 12a-d via the new cyclic hydrazoacetic acids 9a-d.
The hetero Diels-Alder adducts 1 derived from azodibenzoyl and cyclic dienes were transformed to the meso-diaminodicarboxylic acids 6 via the new cyclic hydrazoacetic acids 3.