Enantioselective Synthesis of the Originally Proposed Usneoidone Structure: Evidence for a Structural Revision
作者:Michèle Danet、Marie Normand-Bayle、Jacqueline Mahuteau、Jean d'Angelo、Georges Morgant、Didier Desmaële
DOI:10.1002/ejoc.200300767
日期:2004.5
The enantioselective synthesis of the initially proposed structure of usneoidone has been completed according to a convergent strategy in which the key steps were an enantioselective Michael addition involving chiral imines to set up the C12 quaternary center, and the final assembly of the chiral pyran moiety with the aromatic subunit through a cyanohydrin anion alkylation step. The obtained product
最初提出的 usneoidone 结构的对映选择性合成已根据收敛策略完成,其中关键步骤是涉及手性亚胺的对映选择性迈克尔加成以建立 C12 四元中心,以及手性吡喃部分与芳族亚单元通过氰醇阴离子烷基化步骤。获得的产品显示的光谱数据与报告值显着不同。为 usneoidones 提出了一种假定的修正结构,其中吡喃环是打开的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)