The author of 《Visible Light-Initiated Catalyst-Free One-Pot, Multicomponent Construction of 5-Substituted Indole Chromeno[2,3-b]pyridines》 were Zhang, Mo; Chen, Meng-Nan; Zhang, Zhan-Hui. And the article was published in Advanced Synthesis & Catalysis in 2019. Category: ethers-buliding-blocks The author mentioned the following in the article:
A visible light-initiated pseudo four-component reaction of salicylaldehydes, indole and malononitrile in aqueous Et lactate is described. This pot, at. and step economic (PASE) methodol. provides a practical approach for the preparation of various 5-substituted indole chromeno[2,3-b]pyridines from readily available starting materials at ambient temperature without any catalyst. High yields and excellent functional groups tolerance are observed In the experimental materials used by the author, we found 2-Hydroxy-4-methoxybenzaldehyde(cas: 673-22-3Category: ethers-buliding-blocks)
2-Hydroxy-4-methoxybenzaldehyde(cas: 673-22-3) is the main component of root bark essential oil of Periploca sepium Bunge. It is a potential tyrosinase inhibitor present in African medicinal plants. 2-Hydroxy-4-methoxybenzaldehyde was used in the synthesis of Schiff base ligand.Category: ethers-buliding-blocks
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem