Table 1.
entry | Dienoate | R1 | R2 | R3 | Conditions | Product | Yield |
---|---|---|---|---|---|---|---|
1 | 1 | H | Me | Me | 100 °C, 18 h | 5 | 77% |
2 | 6 | Me | H | Me | 100 °C, 18 h | 7 | 67% |
3 | 11 | H | Me | H | 100 °C, 5 d | 15 | 59% |
4 | 12 | H | H | Me | 100 °C, 2 d | 16 | 53% |
5 | 13 | Me | Me | H | 100 °C, 10 d | 17 | 38% |
6 | 14 | H | H | H | 100 °C, 5 d | 18 | 37% |
Products were formed as one isomer as detected by 1H NMR spectroscopy and GCMS. Yields reported are isolated yields.