Table 4.
| ||||||
---|---|---|---|---|---|---|
entry | substrate | catalysta,b,c | 7 | 8 | dr (cis:trans) | |
1 |
6a |
Rh2(OAc)4 | 58% 7a | 18% 8a | (100:0) | |
1:1.25 AgOTf:phen | 67% 7a | 4% 8a | --- | |||
1:3 AgOTf:phen | 0% 7a | 93% 8a | --- | |||
2 |
6b |
Rh2(esp)2 | 45% 7b | 25% 8bd | nd | |
1:1.25 AgOTf:phen | 89% 7b | 9% 8b | 3.2:1 | |||
1:3 AgOTf:phen | 4% 7a | 87% 8b | 3:1 | |||
3 |
6c |
Rh2(OAc)4 | 68% 7c | 14% 8c | (0:100) | |
1:1.25 AgOTf:phen | 88% 7c | 3% 8c | --- | |||
1:3 AgOTf:phen | 11% 7c | 73% 8c | --- | |||
4 |
6d |
Rh2(OAc)4 | 35% 7d | 5% 8d | --- | |
1:1.25 AgOTf:phen | 85% 7d | <1% 8d | --- | |||
1:3 AgOTf:phen | 23% 7d | 66% 8d | --- | |||
5 |
6e |
Rh2(esp)2 | 25% 7e | 21% 8ed | nd | |
1:1.25 AgOTf:phen | 54% 7e | 39% 8ed | nd | |||
1:3 AgOTf:phen | 0% 7e | 68% 8e | 2.4:1 |
Rh cat.: 3 mol %, 2 equiv PhIO, 4 Å MS, CH2Cl2.
Aziridination: 20 mol % AgOTf, 25 mol % phen, 2 equiv PhlO, 4 Å MS, CH2Cl2.
C–H insertion: 10 mol % AgOTf, 30 mol % phen, 3.5 equiv PhlO, 4 Å MS, CH2Cl2.
NMR yields with mesitylene as the internal standard.