Entry Catalysts Conversion (%) Selectivity 1b (%) Selectivity 1c (%)
1 None [a] trace - -
2 [BDMAEEH][MeOAc] 99 74 26
3 [TMEDAH][MeOAc] 90 65 35
4 [TMPDAH][MeOAc] 94 68 32
5 [TMHDAH][MeOAc] 99 70 30
6 [DMAEAH][MeOAc] 96 71 29
7 [DMAPAH][MeOAc] 99 70 30
8 [DEAPAH][MeOAc] 99 69 31
9 [BDMAEEH][4-F-PhO] 99 66 34
10 [BDMAEEH][NIA] 96 70 30
11 [BDMAEEH][Br] 93 60 40
12 [BDMAEEH][I] [b] 93 44 56
13 [BDMAEE-C1][I] 96 65 35
14 [EMIM][Ac] 89 73 27
15 [BDMAEEH][MeOAc] [c] 99 70 30