Fig. 2: Substrate scope^a.

^aUnless otherwise stated, all reactions were performed on a 0.15 mmol scale. Dr, rr and E/Z ratios were determined by crude ¹H NMR analysis. For unsymmetrical alkynes, unless otherwise noted, >20/1 rrs were observed. The yields were isolated yields. Ee values were determined by chiral HPLC. For details, see Supplementary Information section 6. ^bDr could not be determined by crude ¹H NMR, and the minor diastereomer was not observed after column purification. ^cThe minor Z isomer was not observed after column purification. ^dCo[(S,S)-Ph-BPE]Cl₂ (20 mol%) was used. ^eAcr Mes⁺ClO₄^- (3.0 mol%⁾ was used instead of 3DPA2FBN. ^f4CzTPN-(8^tBu) (3.0 mol%) was used instead of 3DPA2FBN. ^g4DPAIPN (3.0 mol%) was used instead of 3DPA2FBN. ^h(R)-H₈-BINAP (L2, 10 mol^%) was used instead of (S,S)-Ph-BPE, b/l was determined by crude ¹H NMR analysis.