“…The thio-Michael addition reaction has emerged as one of the most powerful tools for C-S bond formation (Fujita and Nagao, 1977). Thio-Michael addition provides a widespread synthetic utility in organic chemistry (i) for chemo-selective protection of olefinic double band in unsaturated carbonyl compounds, (Trost and Keeley, 1975), (ii) for the generation of acyl vinyl cation equivalents (Bakuzia and Bakuzis, 1981), and (iii) for the synthesis of medicinally important compounds (Kumar et al, 1991). Thiol nucleophilic reagents are also known to show chemical reactivity toward chalcones, chalcon epoxides, chalcone dibromides, and their corresponding propynones.…”