Fig. 3. Scope of tandem diyne cyclization/C(sp³)–H insertion of N-propargyl ynamides 1.

1 (0.2 mmol), Cu(MeCN)₄PF₆ (0.02 mmol), NaBAr^F₄ (0.024 mmol), L10 (0.024 mmol), ^mxylene (4 ml), 0 °C, 2–66 h, in Schlenk tubes; yields are those for the isolated products; ees are determined by HPLC analysis; drs are determined by crude ¹H-NMR. ^a−20 °C.