Biomimetic Synthesis of Fused Bispyran: Lewis Acid Effects on Oxacyclizations of Polyepoxides
作者:Frank McDonald、Rongbiao Tong、Xikui Fang、Kenneth Hardcastle
DOI:10.1055/s-2007-983772
日期:2007.7
The biomimetic synthesis of fused bispyran via Lewis acid mediated tandem oxacyclization of a 1,4,7-polyepoxide is explored. The nature of the Lewis acid promoter is critical for the endo-regioselectivity of epoxide cyclization, although anomalous apparent retention of stereochemistry is observed at some reactive centers.
探索了通过路易斯酸介导的 1,4,7-聚环氧化物的串联氧杂环化仿生合成稠合双吡喃。路易斯酸促进剂的性质对于环氧化物环化的内区域选择性至关重要,尽管在一些反应中心观察到立体化学的异常明显保留。