Abstract

Phytochemical investigation of the leaves of Isatis tinctoria Linnaeus led to the isolation of thirty compounds, including thirteen indole alkaloids (1–13), seven quinazolinone alkaloids (14–20), two quinoline alkaloids (21–22), one quindoline alkaloid (23), one simple amide alkaloid (24) and six monoterpenes (25–30). According to spectroscopic data analysis and comparison with the previously reported literature, their structures were elucidated. Among them, six compounds (12, 13, 17, and 22–24) have not been reported from the family Brassicaceae and eight compounds (3, 7, and 25–30) were isolated from the genus Isatis for the first time. Furthermore, the chemotaxonomic significance of isolated compounds has also been elaborated.

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