“…β-pinene is a main constituent of natural turpentine, and nopinone was directly obtained by oxidating β-pinene with potassium permanganate [13]. Nopinone is easy to develop new derivatives because of its C=O group [14,15], and many nopinone derivatives have been reported [16][17][18][19], such as alkylation derivatives of nopinone [20], chiral annulated indenes [21], nopinone triazole ketones [22], pyridine derivatives of pinene [23], chiral 1,3-aminoalcohols and 1,3-diols [24], 4-pyridyl-2-aminopyrimidine derivatives [25], etc. In addition, some novel nopinone derivatives have been synthesized for a functional application in recent years.…”