Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5267051 | Tetrahedron Letters | 2012 | 5 Pages |
Abstract
Two novel caged ent-kauranoids, neolaxiflorins D (1) and E (2), along with three other new ent-kauranoids, neolaxiflorins F-H (3-5), and a known one, eriocalyxin B (6), were obtained from Isodon eriocalyx var. laxiflora. Neolaxiflorin D (1) is the first 15,16-seco-16,17-dinor-ent-kaurane diterpenoid, and neolaxiflorin E (2) is the first 15,16-seco-17-homo-ent-kauranoid. The absolute configurations of ent-kauranoids 1 and 2 were determined by single-crystal X-ray diffraction analyses. Structural analysis of intermediate compounds 3-5 indicated that eriocalyxin B (6) is a biogenetic precursor of caged ent-kauranoids 1 and 2 as illustrated. The cytotoxic activity of the new compounds was evaluated by an MTT assay.
Keywords
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Wei-Guang Wang, Xiao-Nian Li, Xue Du, Ke Dong, Wei Zhao, Hai-Yan Wu, Ling-Mei Kong, Yan Li, Jian-Xin Pu, Han-Dong Sun,