N ‐Alkylation of Fulleropyrrolidines by Aminomethylation Reaction of Ketones/Arylboronic Acids

N ‐alkylation of fulleropyrrolidines in the presence of polyformaldehyde and p ‐toluenesulfonic acid was systematically investigated. With the addition of ketones/arylboronic acids, a series of novel N ‐alkyl fulleropyrrolidines were formed. Nevertheless, in the absence of ketones/arylboronic acids, scarce N ‐methyl fulleropyrrolidines were obtained with the aid of benzyl alcohol. Possible reaction pathways for the formation of N ‐alkyl fulleropyrrolidines were proposed to elucidate the above reaction process.