Two highly oxygenated nor-clerodane diterpenoids from Croton caudatus

Abstract

Two highly oxygenated nor-clerodane diterpenoids, crocleropenes A and B (1 and 2), together with four known compounds (3–6) were isolated from the leaves and twigs of Croton caudatus. Their structures were elucidated by combination of extensive spectroscopic analysis and electronic circular dichroism (ECD) calculations. 1 and 2 represent the first examples of nor-clerodane-3,5(10)-diene diterpenoids. Compounds 1 and 2 exhibited weak cytotoxicity in vitro against MCF-7 cancer cells with IC₅₀ values of 35.8 and 40.2 μM, respectively.

Keywords:

• Euphorbiaceae
• Croton caudatus
• nor-clerodane diterpenoids
• cytotoxic activity

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was financially supported by the Natural Science Foundation of China (Nos. 81722042, 81973195, and 81973203).