Langer, Peter published the artcileNew and efficient synthesis of pyrrolo[3,2-b]pyrrole-2,5-diones by double-anion-capture reactions of ester carbanions with bis(imidoyl)chlorides of oxalic acid, Application of Ethyltert-butylacetate, the publication is Journal of Organic Chemistry (2000), 65(3), 729-734, database is CAplus.
A variety of pyrrolo[3,2-b]pyrrole-2,5-diones were efficiently prepared by a new domino-reaction of ester carbanions with oxalic acid bis(imidoyl)chlorides. This reaction proceeded by condensation of 2 equiv of the ester with the bis(imidoyl)chloride and subsequent intramol. attack of the nitrogen atoms of the bis-enamine intermediate onto the ester groups. The products, which can be regarded as dilactams of pentalene, represent useful synthetic pigments due to their optical features, their stability, and low solubility The UV-visible properties of the pyrrolo[3,2-b]pyrrole-2,5-diones could be efficiently controlled by the substituents attached to the heterocyclic core. The scope and the limitations of the new cyclization reaction were investigated.
Journal of Organic Chemistry published new progress about 5340-78-3. 5340-78-3 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is Ethyltert-butylacetate, and the molecular formula is C8H16O2, Application of Ethyltert-butylacetate.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics