Entry [Ni] Base [H] source Solvent L Yield of 5a (%)b ee of 5a (%)c
1 Ni(COD)2 DABCO HBpin Toluene (RP)-L1 92 97
2 Ni(OTf)2 DABCO HBpin Toluene (RP)-L1 <5 -
3 Ni(OAc)2 DABCO HBpin Toluene (RP)-L1 <5 -
4 Ni(COD)2 DBU HBpin Toluene (RP)-L1 40 15
5 Ni(COD)2 DIPEA HBpin Toluene (RP)-L1 93 92
6 Ni(COD)2 DABCO CB Toluene (RP)-L1 <5 -
7 Ni(COD)2 DABCO Ph2SiH2 Toluene (RP)-L1 <5 -
8 Ni(COD)2 DABCO HBpin Et2O (RP)-L1 99 95
9 Ni(COD)2 DABCO HBpin DCM (RP)-L1 97 94
10 Ni(COD)2 DABCO HBpin EA (RP)-L1 92 97
11 Ni(COD)2 DABCO HBpin iPrOH (RP)-L1 <5 -
12 Ni(COD)2 DABCO HBpin Toluene (RP)-L2 99 98
13 Ni(COD)2 DABCO HBpin Toluene (RP)-L3 99 96
14 Ni(COD)2 DABCO HBpin Toluene (RP)-L4 99 97
15 Ni(COD)2 DABCO HBpin Toluene (RP)-L5 96 96
16 Ni(COD)2 DABCO HBpin Toluene (RP)-L6 91 7
17 Ni(COD)2 DABCO HBpin Toluene (RP)-L7 89 82
18 Ni(COD)2 DABCO HBpin Toluene (RP)-L8 98 98
19 Ni(COD)2 DABCO HBpin Toluene (RP)-L9 <5 -
20 Ni(COD)2 DABCO HBpin Toluene (RP)-L10 87 95