title: A [2 + 2] cycloaddition dimer and a Diels-Alder adduct from Alpinia katsumadai.
abstract: An unusual katsumadain dimer via a [2 + 2] cycloaddition, katsumadain C (1), and a unique chalcone-diarylheptanoid adduct via a Diels-Alder reaction, calyxin Y (2) with novel carbon frameworks, were isolated from the seeds of Alpinia katsumadai. Their structures and relative configurations were determined by spectroscopic evidence.
authors.affiliation: Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, People's Republic of China.
authors.forename: Chang-Shui
authors.initials: CS
authors.lastname: Yang
authors.forename: Xiao-Bing
authors.initials: XB
authors.lastname: Wang
authors.forename: Jun-Song
authors.initials: JS
authors.lastname: Wang
authors.forename: Jian-Guang
authors.initials: JG
authors.lastname: Luo
authors.forename: Jun
authors.initials: J
authors.lastname: Luo
authors.forename: Ling-Yi
authors.initials: LY
authors.lastname: Kong
mesh_terms: D032429:Alpinia / Q000737:chemistry*; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D047188:Chalcones / Q000138:chemical synthesis* / Q000494:pharmacology; D003500:Cyclization; D003503:Cyclobutanes / Q000138:chemical synthesis* / Q000494:pharmacology; D019281:Dimerization; D006801:Humans; D008958:Models, Molecular; D015394:Molecular Structure; D011753:Pyrones / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D047188:Chalcones; D003503:Cyclobutanes; D011753:Pyrones