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Page 8 of 54 Yang et al. Chem Synth 2023;3:7 https://dx.doi.org/10.20517/cs.2022.38
Scheme 6. Organocatalytic tandem reaction of pyrazolone-chromone 4C synthons 11 with benzolactone-derived olefins 1. This figure is
used with permission from the Royal Society of Chemistry [44] .
Scheme 7. Organocatalyzed three-component tandem reaction of benzolactone-derived olefins 1. This figure is used with permission
from the Royal Society of Chemistry [47] .
Similarly, asymmetric Diels-Alder reaction of 2,4,6-trienals via tetraenamine catalysis was also reported by
Zhou et al. . However, only one example was reported, which utilized benzolactone-derived olefins as a 2C
[49]
synthon to afford the chiral spirocyclohexenebenzolactone complex in 96% ee and 10:1 dr.
