Zhu, Jia-Nan; Wang, Wen-Kang; Jin, Ze-Hui; Wang, Qian-Kun; Zhao, Sheng-Yin published the article 《Pyrrolo[3,4-c]pyrazole Synthesis via Copper(I) Chloride-Catalyzed Oxidative Coupling of Hydrazones to Maleimides》. Keywords: copper chloride catalyst oxidative coupling hydrazone maleimide; pyrrolopyrazole synthesis.They researched the compound: 1-(tert-Butyl)-1H-pyrrole-2,5-dione( cas:4144-22-3 ).Formula: C8H11NO2. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:4144-22-3) here.
A variety of pyrrolo[3,4-c]pyrazole derivatives from readily available aldehyde hydrazones and maleimides via direct oxidative coupling under radical cascade reaction have been reported. This method offers satisfactory chem. yields and good functional group compatibility. Moreover, this practical approach is catalyzed by CuCl utilizing air as the oxidant and some control experiments were performed to elaborate the mechanism.
Compounds in my other articles are similar to this one(1-(tert-Butyl)-1H-pyrrole-2,5-dione)Formula: C8H11NO2, you can compare them to see their pros and cons in some ways,such as convenient, effective and so on.
Reference:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics