Diastereoselective synthesis of indolenine-based spiro[pyrazolone-4,2’-pyrrolidine] scaffolds via 1,3-dipolar cycloaddition of 4-aminopyrazolones, aldehydes, and indolenines
In this work, we report a novel one-pot [3+2] cycloaddition of 4-aminopyrazolones, indolenines, and aldehydes. The reaction utilized the in-situ generated azomethine ylides as 1,3-dipoles and 2-alkenylindolenines as dipolarophiles affording...