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9 risultati
Enmein-type 6,7-seco-ent-kauranoids from Isodon sculponeatus.
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Fourteen enmein-type 6,7-seco-ent-kaurane diterpenoids, seven new ones (sculponins M-S, 1-7) and seven known compounds (8-14), were isolated from the aerial parts of Isodon sculponeatus . Compound 1 is the first example of an ent-kauranoid, possessing a 11,12-epoxy group, and compounds 6 and 7 have
Bioactive Enmein-Type ent-Kaurane Diterpenoids from Isodon phyllostachys.
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Thirty-two enmein-type ent-kaurane diterpenoids, including 13 new compounds, were isolated from the aerial parts of Isodon phyllostachys. Compounds 1 and 2 are the first examples of 3,20:6,20-diepoxyenmein-type ent-kauranoids, and the structures of these new compounds were established mainly by
Library construction and biological evaluation of enmein-type diterpenoid analogues as potential anticancer agents.
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A library of promising enmein-type 14-O-diterpenoid derivatives was constructed from a commercially available kaurene-type oridonin by practical and efficient synthetic methods. These synthetic derivatives were evaluated for their antiproliferative activities against a set of four human cancer cell
Enmein-type diterpenoid analogs from natural kaurene-type oridonin: Synthesis and their antitumor biological evaluation.
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A series of enmein-type diterpenoid analogs (11-20) derived from natural kaurene-type diterpenoid oridonin were synthesized and biologically evaluated. All target compounds showed improved anti-proliferative activities against four human cancer cell lines compared with natural oridonin and parent
Effective enmein-type mimics of clinical candidate HAO472: Design, synthesis and biological evaluation.
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A series of enmein-type diterpenoid amino acid ester derivatives (14-22) were designed and synthesized according to l-alanine-(14-oridonin) ester trifluoroacetate (clinical candidate HAO472). Their antiproliferative activities were tested against SGC-7901, Bel-7402, HL-60, PC-3, A549 and K562 cancer
The conversion of oridonin to spirolactone-type or enmein-type diterpenoid: synthesis and biological evaluation of ent-6,7-seco-oridonin derivatives as novel potential anticancer agents.
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Starting from commercial available natural product oridonin (1), a practical synthesis of ent-6,7-seco-oridonin derivatives (2, 3, 5, and 9) was accomplished and their biological activities were evaluated. The conversion of spirolactone-type diterpenoid to enmein-type was first completed. The
Novel enmein-type diterpenoid hybrids coupled with nitrogen mustards: Synthesis of promising candidates for anticancer therapeutics.
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Natural derived enmein-type diterpenoids exert cytotoxicity against a wide range of human cancer cells. Yet their medicinal applications are hindered by insufficient potency for chemotherapy. Hence, a series of novel enmein-type diterpenoid hybrids coupled with nitrogen mustards were designed and
Cytotoxic ent-kaurane diterpenoids from Isodon sculponeata.
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Four new ent-kaurane diterpenoids, sculponeatins F-I (1-4), together with six known compounds, sculponeatin E (5), epi-nodosin (6), epi-nodosinol (7), enmein (8), and macrocalyxoformins A and B (9 and 10), were isolated from the leaves of Isodon sculponeata. Also obtained were ursolic acid,
Bioactive ent-kaurane diterpenoids from Isodon rosthornii.
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Isorosthin A (1), the first 20-nor-enmein-type diterpenoid, and 15 new ent-kauranoids, isorosthins B-P (2-16), along with 22 known analogues were isolated from the aerial parts of Isodon rosthornii. The structures of 1-16 were elucidated by means of spectroscopic analysis. The relative configuration
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