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Yamashita H, Doi N, Hanawa N, Itoh M, Nakano W, Takahashi E, Mizukami M, Kaneda K, Suzuki Y, Goto M, Lee KH, Wada K. Eleven new C 19-diterpenoid alkaloids from Delphinium elatum cv. Pacific Giant. J Nat Med 2021; 76:161-170. [PMID: 34669108 DOI: 10.1007/s11418-021-01569-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 09/09/2021] [Indexed: 11/30/2022]
Abstract
Diterpenoid alkaloids, the main components of plants of the genera Aconitum, Delphinium, and Garrya, are a group of natural products with notable chemical properties and biological activities. Several C19-diterpenoid alkaloid components from Delphinium elatum cv. Pacific Giant, as well as their derivatives, exhibited cytotoxic activity against lung, prostate, cervical, and vincristine-resistant cervical cancer cell lines. In the current phytochemical investigation on the seeds of D. elatum cv. Pacific Giant, eleven new C19-diterpenoid alkaloids, elapaciline (1), meladine (2), melapacitine (3), iminoeladine (4), 19-oxopaciline (5), 19-oxopacinine (6), N-deethyldelpheline (7), N-deethylpacinine (8), N-deethyl-19-oxoeladine (9), N-deethyl-N-formyleladine (10), and N-deethyl-N-formyldelpheline (11), together with 15 known C19-diterpenoid alkaloids were isolated. Their structures were elucidated by extensive spectroscopic methods including NMR (1D and 2D), IR, and MS (HRMS). Three known diterpenoid alkaloids, 6-dehydrodelcorine (12), delelatine (23), and 6-dehydroeldelidine (24), were isolated for the first time from this plant. Six of the new C19-diterpenoid alkaloids (2, 4-7, and 11) and three of the known diterpenoid alkaloids (18, 23, and 24) were evaluated for cytotoxic activity against five human tumor cell lines.
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Affiliation(s)
- Hiroshi Yamashita
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 4-1, 7-jo 15-choume, Maeda, Teine-ku, Sapporo, 006-8585, Japan
| | - Nozomi Doi
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 4-1, 7-jo 15-choume, Maeda, Teine-ku, Sapporo, 006-8585, Japan
| | - Nana Hanawa
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 4-1, 7-jo 15-choume, Maeda, Teine-ku, Sapporo, 006-8585, Japan
| | - Manami Itoh
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 4-1, 7-jo 15-choume, Maeda, Teine-ku, Sapporo, 006-8585, Japan
| | - Wataru Nakano
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 4-1, 7-jo 15-choume, Maeda, Teine-ku, Sapporo, 006-8585, Japan
| | - Eri Takahashi
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 4-1, 7-jo 15-choume, Maeda, Teine-ku, Sapporo, 006-8585, Japan
| | - Megumi Mizukami
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 4-1, 7-jo 15-choume, Maeda, Teine-ku, Sapporo, 006-8585, Japan
| | - Kyousuke Kaneda
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 4-1, 7-jo 15-choume, Maeda, Teine-ku, Sapporo, 006-8585, Japan
| | - Yuji Suzuki
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 4-1, 7-jo 15-choume, Maeda, Teine-ku, Sapporo, 006-8585, Japan
| | - Masuo Goto
- Natural Products Research Laboratories, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC, 27599-7568, USA
| | - Kuo-Hsiung Lee
- Natural Products Research Laboratories, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC, 27599-7568, USA.,Chinese Medicine Research and Development Center, China Medical University and Hospital, Taizhong, Taiwan
| | - Koji Wada
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 4-1, 7-jo 15-choume, Maeda, Teine-ku, Sapporo, 006-8585, Japan.
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