ASODAFCA · Asymmetric Organocatalysed Diels-Alder/Fragmentation Cascades
7РП — „Хора“ (Действия „Мария Кюри“)
- Период
- 2010-03-01 → 2012-02-29
- Финансиране от ЕС
- 173 241 €
- Участници
- 1
- Схема
- MC-IEF
Линиите свързват координатора с партньорите.
Накратко на български
Химици разработват методи за синтезиране на сложни органични молекули, като например Daphniyunnine D. Това е важно, тъй като тези вещества проявяват противоракова активност и помагат за разбирането на техните свойства.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Asymmetric Organocatalysed Diels-Alder/Fragmentation Cascades
Our proposal is based on the development of the intramolecular Diels-Alder reaction of 2-amino-furan derivatives (IMDAF) as powerful tool for the quick synthesis of complex polycyclic compounds related to the Daphnyphillum family, in particular Daphniyunnine D. This molecule, first isolated in 2006 from Daphniphyllum yunnanense,1 presents an interesting anti-cancer activity (IC50 0.6µg.mL-1 against A-549 cell lines) and has never been synthesised. Intramolecular Furan-Diels Alder route to the core of Daphniyunnine D An enantioselective route to the functionalized core of daphniyunnine D has been developed using a newly developed enantioselective intramolecular Diels Alder of tethered furans as proposed in ASODAFCA. The synthetic synthetic sequence is currently being investigated in the Dixon laboratories in order to achieve the first total synthesis of this natural product. Pauson-Khand approach to the 7-5-5 ring system of Daphnyiunnine D and Daphnilongeranine B The construction of the 7-5-5 ring system Daphnyiunnine D and Daphnilongeranine B (highlighted part in Scheme 2) has been successfully achieved using a Pauson-Khand approach (Scheme 2). The route has been published in Organic Letters (see attached list of publicationsand will be used as an end-game for the sequence proposed in Scheme 1. Michael addition-RCM route to the functionalized tetracyclic core of Daphniyunnine B An enantioselective route for the enantioselective total synthesis of Daphniyunnine B has been developed starting from cheap, commercially available (S)-carvone. In the most advanced intermediate 4 of the 5 ring systems have been established and ALL the stereocenters present in the final product have been installed. We anticipate the completion of the total synthesis in the Dixon laboratories in a short period of time. The racemic route based on a similar approach has been already published in Organic Letters (see attached list of publications). 2) Summary of the progress of the research training 2-1) Research Skills and techniques: NMR techniques, GC, HPLC, etc., and the determination of enantiomeric excess using a variety of methods. 2-2) Communication skills: Results, progress and the work plan for the near future have been discussed on a weekly basis, and the presentation of results to the group have been made every week following the group’s usual timetable. Weekly group meetings offered the opportunity for in-depth discussions involving all post-doctoral and post-graduate workers. In addition, weekly one-to-one meetings with Prof. Dixon have been often used to discuss progress, strategy and the direction of the research.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The intramolecular Diels-Alder reaction of 2-amino-furan derivatives is a powerful tool for the rapid synthesis of complex polycyclic compounds. The reaction has been used as a key step in the preparation of biologically relevant molecules such as natural products and pharmaceuticals. However, despite the great potential of this kind of Diels-Alder reaction, no catalytic asymmetric version has been reported so far. During this Fellowship we wish to develop new, asymmetric, organocatalysed cyclisation reactions of substrates bearing an amino-furan derivative and an enone functionality. In the presence of primary or secondary chiral amines, alpha,beta-unsaturated compounds undergo LUMO-lowering activation via the reversible formation of transient iminium ions. The concept of our proposal is to apply the iminium ion activation of enones to induce asymmetry in the Diels-Alder cycloaddition with appended amino-furan moieties. Furthermore, it is known that stereocenters at the gamma-position of enones can be racemised in the presence of primary/secondary amines via the formation of dienamine intermediates. Therefore, a further target will be the development of a tandem transformation involving a Dynamic Kinetic Resolution (DKR) and an Intramolecular Diels-Alder reaction of 2-amino-furan derivatives with enones presenting a stereogenic centre at the gamma-carbon. This would constitute a new, powerful and broadly applicable organocatalytic asymmetric strategy to target, in the first instance, alkaloids of the Daphniphyllum family. In particular, we are interested in the enantioselective synthesis Daphniyunnine D (IC50 0.6 μM against A549 cancer cell line). The Fellowship will therefore involve different branches of modern chemical research, such as asymmetric methodology, catalysis, target oriented synthesis of bioactive compounds.
Оригинален текст от CORDIS (на английски).
Участници
- THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD · OxfordКоординаторОбединеното кралство
Връзки
Данни: CORDIS, © Европейски съюз