scheme22

Scheme 22. N-heterocyclic carbene-catalyzed annulation of benzolactone-2-ones 43 and enals 44. This figure is used with permission from the Royal Society of Chemistry[71].
Scheme 22. N-heterocyclic carbene-catalyzed annulation of benzolactone-2-ones 43 and enals 44. This figure is used with permission from the Royal Society of Chemistry[71].
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