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Comparison of the 1H NMR data of ring protons for compounds 1a, 1b’, and product 8b.
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| Ref. | Chemical shift/ppm | Coupling constant | Ref. | Chemical shift/ppm | Coupling constant | ||||
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| Ha | Hb | J [Hz] | Ha | Hb | J [Hz] | ||||
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| 8b | 4.61 (br s) | 5.71 (br s) | – | ||||||
| [12] | 1b’ | 4.66 (d) | 5.77 (d) | 2.0 | [12] | 1a | 4.17 (d) | 5.39 (d) | 6.0 |
| [13] | 1b’ | 4.66 (d) | 5.74 (d) | 1.8 | [13] | 1a | 4.15 (d) | 5.38 (d) | 6.0 |
| [19] | 1b’ | 4.59 (s) | 5.67 (s) | – | [7] | 1a | 4.15 (d) | 5.37 (d) | 5.9 |
