ガンビア酸Aの全合成と完全なステレオ構造
Haruhiko Fuwa1, Kazuya Ishigai, Keisuke Hashizume
1Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan. hfuwa@bios.tohoku.ac.jp
Journal of the American Chemical Society
|July 12, 2012
まとめ
強力な抗真菌化合物であるガンビア酸Aの全合成が初めて成功しました. この画期的な研究は,この複雑な自然産物の完全なステレオ構造を決定的に確立しました.
科学分野:
- 自然製品化学 自然製品化学
- オーガニック・シンセシス オーガニック・シンセシス
- 薬用化学 薬用化学について
背景:
- ガンビア酸Aは,重要な抗真菌性を持つポリサイクルエーテル代謝産物である.
- ガンビア酸Aの複雑な構造と生物学的活性により,合成対象として難しい課題となっています.
- そのステレオ構造を理解することは,その作用機構を明らかにし,潜在的な薬物開発に不可欠です.
研究 の 目的:
- ガンビア酸Aの最初の完全合成を達成するために.
- ガンビア酸Aの完全なステレオ構造を確認し,確立する.
- 更に生物学的評価とアナログ開発のための合成経路を提供すること.
主な方法:
- 先進的な合成方法論を用いた多段階の有機合成.
- ポリサイクルエーテルコアの複雑なステレオ化学を制御するためのステレオ選択反応.
- 構造的確認のための光譜分析 (NMR,MS).
主要な成果:
- ガンビア酸A.A.の全合成が完了しました.
- 自然製品の完全なステレオ構造の明確な決定.
- 関連化合物に適用できる堅実な合成戦略の開発.
結論:
- ガンビア酸Aの最初の完全合成が達成されました.
- この強力な抗真菌剤の完全なステレオ構造は,今やしっかりと確立されています.
- この合成により,ガンビア酸Aおよびそのアナログの薬効的可能性を調査する道が開かれました.
関連する概念動画
02:33Stereoisomerism of Cyclic Compounds
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
01:28Structures of Carboxylic Acid Derivatives
Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
02:52Stereoisomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
01:28Diels–Alder Reaction Forming Cyclic Products: Stereochemistry
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
02:32Stereoisomers
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to restricted...
01:29Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.