Table 3.
Preparation of compounds 7.

| Entry | 1 | R1 | R2 | 6 | Yield of 7 (%) a |
|---|---|---|---|---|---|
| 1 | 1a | Me | Ph | 6c | 7a, 96 |
| 2 | 1b | Ph | Ph | 6c | 7b, 79 |
| 3 | 1e | Me | CH2OAc | 6c | 7c, 81 |
| 4 | 1f | Ph | CH2OAc | 6c | 7d, 63 |
a Refers to percent yield of pure (by TLC and IR) isolated product.
Preparation of compounds 7.

| Entry | 1 | R1 | R2 | 6 | Yield of 7 (%) a |
|---|---|---|---|---|---|
| 1 | 1a | Me | Ph | 6c | 7a, 96 |
| 2 | 1b | Ph | Ph | 6c | 7b, 79 |
| 3 | 1e | Me | CH2OAc | 6c | 7c, 81 |
| 4 | 1f | Ph | CH2OAc | 6c | 7d, 63 |
a Refers to percent yield of pure (by TLC and IR) isolated product.