Biomimetic macrocycle-forming Diels-Alder reaction of an iminium dienophile: synthetic studies directed toward gymnodimine |
| |
Authors: | Johannes Jeffrey W Wenglowsky Steve Kishi Yoshito |
| |
Institution: | Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA. |
| |
Abstract: | The macrocyclic core of gymnodimine has been constructed via an intramolecular Diels-Alder reaction of an alpha,beta-unsaturated iminium dienophile in water. The cycloaddition furnished a single exo-product, along with two endo-products. Through X-ray analysis of a suitable derivative, the stereochemistry of the exo-product was established, thereby demonstrating that its stereochemistry matches that of gymnodimine. In contrast, macrocyclization of an analogous alpha,beta-unsaturated ketone dienophile gave only undesired endo-products. Interestingly, the imine dienophile shows remarkable stability in water. reaction: see text] |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|