クロロフーシン,その7つの染色体ダイアステロエーマー,および主要な部分構造の総合成
Ryan C Clark1, Sang Yeul Lee, Dale L Boger
1Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
Journal of the American Chemical Society
|August 21, 2008
まとめ
p53-MDM2複合体の形成の天然阻害体であるクロロフーシンの全合成が達成されました. この研究では,その複雑な染色体の絶対的立体化学を割り当て,相対的立体化学を再割り当てました.
科学分野:
- 自然製品合成 自然製品合成
- 薬用化学 薬用化学について
- 有機化学 オーガニック・ケミストリー
背景:
- クロロフウシンはp53-MDM2複合体の形成の天然阻害剤です.
- その構造には,オルニチン経由で周期性ペプチドと結びついたアザフィロン染色体がある.
研究 の 目的:
- クロロフーシンの全合成を報告する.
- クロロフウシン染色体の絶対的立体化学を割り当てるために.
- クロロフーシンの染色体の相対的立体化学を再配置する.
主な方法:
- アザフィロン染色体前駆体とオルニチン・スレオニン・ディペプチドの合成.
- 凝縮反応と1段階の酸化/スパイロサイクリングにより,ダイアステロエーマーが生成されます.
- ステレオ化学的割り当てのための光譜分析 (NMR,MS).
- コンバージェント・トータル・シンセシスアプローチ.
主要な成果:
- 染色体-二ペプチド結合体の8つのダイアステロエーマーをすべて合成しました.
- 自然のクロロフウシン染色体の (4R,8S,9R) -ステレオ化学を割り当てました.
- ステレオ化学的再配分を確認し,クロロフーシンの絶対的ステレオ化学を確立しました.
- クロロフーシンの残りの7つの可能な染色体ダイアステロエーマーすべてを合成した.
結論:
- クロロフーシンの全合成が成功裏に完了しました.
- クロロフウシン染色体の絶対的および相対的立体化学が決定的に割り当てられました.
- この研究は,さらなる生物学的評価のために様々なクロロフーシンのダイアステロエーマーにアクセスできるようにしています.
関連する概念動画
Stereoisomerism 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,...
Radical Halogenation: Stereochemistry
Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
Halogenation to form a new chiral center:
UV–Vis Spectroscopy: Woodward–Fieser Rules
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
Molecules with Multiple Chiral Centers
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
Fischer Projections
Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
Diels–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.

![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
