Entry | Lewis acid | Yield/% | Selectivity | ||
2 | 3 | 1 | 2/3/1 | ||
1 | Yb(OTf)3 | 4.8 | 0.0 | 79.1 | 5.7/0.0/94.3 |
2 | Sm(OTf)3 | 1.2 | 0.0 | 76.6 | 1.5/0.0/98.5 |
3 | ZnCl2 | 0.0 | 4.9 | 59.2 | 0.0/7.6/92.4 |
4 | MgBr2 | 0.0 | 0.0 | 59.9 | 0.0/0.0/100.0 |
5 | NiBr2 | 3.1 | 0.0 | 39.4 | 7.3/0.0/92.7 |
6 | Ni(acac)3 | 0.0 | 0.0 | 86.6 | 0.0/0.0/100.0 |
7 | Co(BF4)2∙6H2O | 10.3 | 0.0 | 32.0 | 24.3/0.0/75.7 |
8 | CoCO3 | 0.0 | 1.8 | 81.4 | 0.0/2.2/97.8 |
9 | Co(ClO4)2∙6H2O | 8.2 | 0.0 | 40.1 | 16.9/0.0/83.1 |
10 | Co(NO3)2∙6H2O | 1.4 | 30.5 | 29.6 | 4.0/13.8/82.2 |