Table 1.
Yield4/5[%] | Yield7/8[%] | Yield10/11[%] | |||||
---|---|---|---|---|---|---|---|
1 a | 2.9:1 | 78 | 1.4:1 | 53 | 3.3:1 | 54 | |
1 b | 1:2.4 | 98 | 1.4:1 | 40 | 11:1 | 64 | |
1 c | 1.3:1 | 98 | 4.5:1 | 75 | 5.0:1 | 52 | |
1 d | 1:1.6 | >99 | 2.5:1 | 60 | 2.0:1 | 95 | |
1 e | 1:9 | 98 | 6.5:1 | 53 | only 10 | 26 | |
1 f | 1:1.9 | 84 | 15:1 | 50 | only 10 | 55 |
[a] Combined yields of the isolated products. Product ratios are taken from 1H NMR spectroscopy of the combined isolated products for compounds 4/5 and from crude mixtures for compounds 7/8 and 10/11.