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Asymmetric Interceptive DcA of Cyclic β-Ketoesters
 | ||||||
|---|---|---|---|---|---|---|
| entry | R | R′ | yield | dr (A:B) | A | B |
| 1 | Me |
|
97% | 1:>20 | — |
 89% ee |
| 2 | Et | 99% | 1:>20 |
 71% ee |
 97% ee |
|
| 3 | Me |
|
54% | 1:>20 | — |
 97% ee |
| 4 | Et |
|
92% | 1:>2.3 |
 89% ee |
 96% ee |
|
| ||||||
 100, 66% 1:1.2 d.r. 43% ee (major) |
 101, 76% |
|||||
