Supported TBD-Assisted Solution Phase Diversification of Formyl-Aza-Heterocycles Through Alkylation-Knoevenagel One Pot Sequences
作者:Abdelaziz El Maatougui、Abel Crespo、Artur M.S. Silva、Alberto Coelho
DOI:10.2174/138620711796367229
日期:2011.8.1
An efficient solution-phase parallel procedure to perform the structural diversification of some formyl-nitrogen heterocycles (A) using the reusable TBD supported base is described. The library synthesis is based in a consecutive Alkylation-Knoevenagel functionalisation that uses alkyl halides (B), Michael acceptors (C) and activated methylene compounds (D) as diversity elements.
Palladium‐Catalyzed C3‐Carbaldehyde Directed Regioselective C2‐Thioarylation of Indoles
作者:Sandip Kumar Gupta、Niranjan Panda
DOI:10.1002/asia.202400272
日期:2024.6.3
directing potential of weakly coordinating aldehyde group present at 3-position of indole was exploited for regioselective C2-H thioarylation over the possible C4-H functionalization. Mechanistic studies reveal that the process involves initial generation of thioaryl radical followed by sequential C−H activation, thiolate transfer, and reductiveelimination.