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| entry | R1 in 7 | R2 in 7 | TTN 8 | TTN 9 |
|---|---|---|---|---|
| a | -OMe | -H | 300 | 270 |
| b | -Me | -H | 190 | 400 |
| c | -H | -Me | 100 | 390 |
| d | -H | -H | 30 | 500 |
| e | -CHO | -H | <1a | 510 |
Trace product observed by liquid chromatography-mass spectrometry (LC-MS).
