“…In this context, while the utility of α-haloenol esters remains almost unexplored due to the lack of efficient and general synthetic methods [7][8][9][10], more accessible β-haloenol esters have gained significance in recent years as coupling partners in diverse chemical transformations. Several methodologies can be employed for the preparation β-haloenol esters, the most classical ones involving the acylation of haloenolate anions [11][12][13][14][15] or the haloacyloxylation of alkynes employing the elemental halogens [16][17][18][19][20], bis(pyridine)iodonium tetrafluoroborate (IPy2BF4) [21][22][23][24][25], N-halosuccinimides (NXS; X = Cl, Br, I) [26][27][28], PhI(OAc)2 [29][30][31], trihaloisocyanuric acids [32] or N,N-dibromo-p-toluenesulfonamide (TsNBr2) [33] as the electrophilic halogen source (Scheme 1). In this context, while the utility of α-haloenol esters remains almost unexplored due to the lack of efficient and general synthetic methods [7][8][9][10], more accessible β-haloenol esters have gained significance in recent years as coupling partners in diverse chemical transformations.…”