Biomimetic Macrocycle-Forming Diels−Alder Reaction of an Iminium Dienophile: Synthetic Studies Directed Toward Gymnodimine
作者:Jeffrey W. Johannes、Steve Wenglowsky、Yoshito Kishi
DOI:10.1021/ol051553n
日期:2005.9.1
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
裸草二胺的大环核心是通过水中的α,β-不饱和亚氨基二烯亲烯分子的分子内Diels-Alder反应构建的。环加成反应提供了一个外生产物,以及两个内生产物。通过对合适的衍生物进行X射线分析,建立了外泌产物的立体化学,从而证明了其立体化学与裸gym草碱的立体化学匹配。相反,类似的α,β-不饱和酮二烯亲和物的大环化仅产生不希望的内产物。有趣的是,亚胺二亲物在水中显示出显着的稳定性。[反应:看文字]