“…With this in mind, and in continuation of our research on the use of LR for the synthesis of novel heterocyclic scaffolds with possible biological properties, [20][21][22][23] we have investigated the reaction of LR with Mannich base hydrochlorides derived from acyclic and cyclic ketones, which could represent an easy and general method to access novel types of 4H-1,3,2-oxathiaphosphorine derivatives.…”