Background: Catalyst-free nucleophilic substitution between hydroxylactam and thiol was
developed for the construction of N (acyl), S-acetal skeletons.
Methods: The new protocol provides a series of isoindolo-β-carboline-derived N (acyl), S-acetals in
Result: The methodology has many advantages, such as catalyst-free, mild reaction conditions, simple
operations, high atom-economy, and water as by-product and so on. The reaction mechanism was