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(a) N-(But-3-yn-1-yl)-2-chloroacetamide, CuBr, iPrNEt2, dimethylformamide (DMF). (b) 4 M HCl–dioxane. (c) EDCI, HOBt, Et3N, DMAc. (d) N-(But-3-yn-1-yl)-2-bromoacetamide, CuBr, iPrNEt2, DMF.
