Table 1.
| ||||||||
---|---|---|---|---|---|---|---|---|
entry | ethers | R3 | producta | yield (%) | ee (%) | |||
1 | 2 | Ph | 8 | 13 | 78 | 99 | ||
2 | 2-Naph | 9 | 14 | 88 | 99 | |||
3 | p-OMePh | 10 | 15 | 77 | 98 | |||
4 | Et | 11 | 16 | 87 | 98 | |||
5 | Me | 12 | 17 | 67 | 93 | |||
6 | 4 | Ph | 8 | 18 | 88 | 99 | ||
7 | 5 | Ph | 8 | 19 | 75 | 98 | ||
8 | 6 | Ph | 8 | 20 | 89 | 99 | ||
9 | 7 | Ph | 8 | 21 | 74 | 99 |
The diastereoselective ratio is greater than 30:1 in all reactions