Synthesis of α-Chloroaldoxime O-Methanesulfonates and Their Use in the Synthesis of Functionalized Benzimidazoles
摘要:
Three different alpha-chloroaldoxime O-methanesulfonates were synthesized to investigate their chemical properties. The compounds were found to be stable and were able to be stored at ambient temperature without any precautions. The reactions with anilines were investigated, and it was found that an additive is required to activate the sulfonate. TMEDA was found to be the most efficient additive, and various benzimidazoles were synthesized through the reaction.
4-Substituted imidazolidin-2-ones were synthesized via the one-pot reaction of bench-stable α-chloroaldoxime O-methanesulfonates and 4-aminobut-2-enoates in the presence of N,N-dimethylaminopyridine. This cascade transformation involved nucleophilic substitution, Tiemann rearrangement and intramolecular Michael addition. The electronic effect of the aryl substituent of the chloroaldoximes played a
DMAP-Catalyzed Domino Reactions of α-Chloroaldoxime O-Methanesulfonates and 2-Aminobenzoic Acids for the Synthesis of Quinazolinediones
作者:Juthanat Kaeobamrung、Watcharadet Kaewman
DOI:10.1055/a-2107-5653
日期:2023.10
α-chloroaldoxime O-methanesulfonates via DMAP-catalyzed domino reactions under mild reaction conditions in one-pot fashion. Chemical transformations involved nucleophilic substitution, Tiemann rearrangement, and cyclic urea formation. The strength of nitrogennucleophile of 2-aminobenzoic acids and the high level of carbon electrophile of α-chloroaldoxime O-methanesulfonates were crucial for the reaction