（＋）-（4S,5R）-and （-）-（4R,5S）-osmundalactones as well as （＋）-（4R,5S）- and （-）-（4S,5R）- 5-hydroxy-2-hexen-4-olides were synthesized by a concise and efficient synthesis method starting from 4-benzyloxy-...（＋）-（4S,5R）-and （-）-（4R,5S）-osmundalactones as well as （＋）-（4R,5S）- and （-）-（4S,5R）- 5-hydroxy-2-hexen-4-olides were synthesized by a concise and efficient synthesis method starting from 4-benzyloxy-5-hydroxy-2（E）-hexenoate in good yield with over 99% e.e..展开更多
A new halogenated biindole and a new apo-carotenone have been isolated from the ethanolic extract of the green alga Chaetomorpha basiretorsa Sethcell. On the basis of chemical and spectroscopic methods including 2D NM...A new halogenated biindole and a new apo-carotenone have been isolated from the ethanolic extract of the green alga Chaetomorpha basiretorsa Sethcell. On the basis of chemical and spectroscopic methods including 2D NMR technique, their structures have been elucidated as 4,4′-dichloro-5,5′-dibromo-7,7′-dimethoxy-2,2′-bi-1H-indole and 1′S*,4′R*-8-(4′-hydroxy-2′,6′,6′- trimethylcyclohex-2-enyl)-6-methyloct-3E,5E,7E-trien-2-one, respectively.展开更多
文摘（＋）-（4S,5R）-and （-）-（4R,5S）-osmundalactones as well as （＋）-（4R,5S）- and （-）-（4S,5R）- 5-hydroxy-2-hexen-4-olides were synthesized by a concise and efficient synthesis method starting from 4-benzyloxy-5-hydroxy-2（E）-hexenoate in good yield with over 99% e.e..
基金supported by national 863 project(Grant No.2004AA625030,2001AA620503)NNSFC(Grant No.20432030)Key Innovative Project of the Academy(Grant No.KZCX3-SW-215).
文摘A new halogenated biindole and a new apo-carotenone have been isolated from the ethanolic extract of the green alga Chaetomorpha basiretorsa Sethcell. On the basis of chemical and spectroscopic methods including 2D NMR technique, their structures have been elucidated as 4,4′-dichloro-5,5′-dibromo-7,7′-dimethoxy-2,2′-bi-1H-indole and 1′S*,4′R*-8-(4′-hydroxy-2′,6′,6′- trimethylcyclohex-2-enyl)-6-methyloct-3E,5E,7E-trien-2-one, respectively.
