Synthesis of (±)-kuwanon V and (±)-dorsterone methyl ethers via Diels–Alder reaction
作者:Chin Fei Chee、Yean Kee Lee、Michael J.C. Buckle、Noorsaadah Abd Rahman
DOI:10.1016/j.tetlet.2011.02.023
日期:2011.4
Diels–Alder adducts, the pentamethyl ethers of kuwanon V 1a and dorsterone 2a were synthesised via a biomimetic intermolecular [4+2] cycloaddition reaction between a highly electron-rich dienophile and a Lewis acid sensitive diene derived from chalcone. Cycloaddition under thermal conditions afforded 1a and 2a (in 3:2 ratio). Cycloaddition catalysed by AgOTf/Bu4NBH4 gave higher yields of the adducts.
桑树Diels–Alder加合物,kuwanon V 1a的五甲基醚和dorsterone 2a是通过高度电子富集的亲二烯体和衍生自查耳酮的Lewis酸敏感二烯之间的仿生分子间[4 + 2]环加成反应合成的。在热条件下加环得到1a和2a(以3:2的比例)。AgOTf / Bu 4 NBH 4催化的环加成反应使加合物的收率更高。