Hiremath, Shivayogi P. published the artcileSynthesis of 11H-1,2,4-triazolo[4,3-b]pyridazino[4,5-b]indoles, Name: Ethyl 5-bromo-3-formyl-1H-indole-2-carboxylate, the publication is Indian Journal of Heterocyclic Chemistry (1994), 3(3), 145-8, database is CAplus.
4-Oxo-5H-pyridazino[4,5-b]indoles, obtained from the corresponding 3-formylindole-2-carboxylates, were subjected to chlorination to obtain the corresponding 4-chloro-5H-pyridazino[4,5-b]indoles which on reaction with hydrazine hydrate in the presence of K2CO3 give 4-hydrazino-5H-pyridazino[4,5-b]indole. The latter were treated with acetic acid/benzoyl chloride to yield the desired title compounds I (R = Me, OMe, Br, OEt, Cl; R1 = Me, Ph). These compounds were screened for their antimicrobial activity.
Indian Journal of Heterocyclic Chemistry published new progress about 100123-25-9. 100123-25-9 belongs to indole-building-block, auxiliary class Indole,Bromide,Ester,Aldehyde, name is Ethyl 5-bromo-3-formyl-1H-indole-2-carboxylate, and the molecular formula is C12H10BrNO3, Name: Ethyl 5-bromo-3-formyl-1H-indole-2-carboxylate.
Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles