Insights into the Friedel-Crafts Benzoylation of N-Methylpyrrole inside the Confined Space of the Self-Assembled Resorcinarene Capsule.

ABSTRACT: Friedel-Crafts benzoylation of N-methylpyrrole 2 can run inside the confined space of the hexameric resorcinarene capsule C. The bridged water molecules at the corner of C act as H-bonding donor groups to polarize the C-Cl bond of benzoyl chlorides 3a-f. Confinement effects on the regiochemistry of the FC benzoylation of N-methylpyrrole are observed. The nature of the para-substituents of 3a-f and their ability to establish H-bonds with the water molecules of C work synergistically with the steric constrictions imposed by the capsule to drive the regiochemistry of products 4a-f. QM investigations indicate that inside the cavity of C, the FC benzoylation of 2 has a bimolecular concerted S_N2 mechanism, appropriately, above-plane nucleophilic vinylic substitution (S_NVπ)─supported by H-bonding interactions between water molecules and both the leaving Cl atom and the carbonyl group.

SUBMITTER: Iuliano V 

PROVIDER: S-EPMC10496122 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature