23 2,3の新天然カロチノイドについて

概要

論文の詳細を見る
1) Ternstroemiaxanthin A new carotenoid, ternstroemiaxanthin, was isolated from the red seeds of "Ternstroemia japonica" (mokkoku) as a main constituent, and the structure of the pigment was determined by spectral and chemical methods to be 3-hydroxy-β-ψ-caroten-18'-al (I). This is the first example of the presence of aldehydic C_<40>-carotenoid in higher plants. 2) Two Acetylenic Aromatic Carotenoids Among seven carotenoid hydrocarbons isolated from a sea sponge "Reniera japonica", two minor pigments, m.p. 205℃ and m.p. 194℃ have been remained structurally unsolved because of the paucity of materials. Recently considerable amount of samples has been isolated and enough evidences have been obtained to conclude that they have structures of acetylenic aromatic carotenoids (VII) (m.p. 205℃) and (IX) (m.p. 194℃) respectively. This is the first establishment of the natural occurrence of acetylenic aromatic carotenoids. In order to confirm these structures, synthesis of these pigments have been carried out. The Wittig condensation of phosphonium salts, XIII and XXVI, with C_<25>-aldehyde (XVI) gave 3,4-cis-products which were identified with the stereomutation product of natural products.
天然有機化合物討論会の論文
1972-10-01