作者:Akihiro Ogura、Taisuke Ito、Koujiro Moriya、Hiroki Horigome、Ken-ichi Takao
DOI:10.1016/j.tetlet.2021.153075
日期:2021.5
We report the first asymmetric Diels–Alder reaction between furan and propiolates. Propiolate, a dienophile, was equipped with an Evans’ auxiliary and a sulfonyl group to control and facilitate diastereoselective cycloaddition. Treatment with furan as a diene and aluminium Lewis acid afforded a 7-oxabicyclo[2.2.1]heptadiene skeleton diastereoselectively. The origin of diastereoselectivity can be explained
我们报道了呋喃和丙酸酯之间的第一个不对称Diels-Alder反应。丙二酸酯,一种亲二烯体,配备有埃文斯助剂和磺酰基,以控制和促进非对映选择性环加成。用呋喃作为二烯和铝路易斯酸处理可选择性地得到7-氧杂双环[2.2.1]庚二烯骨架。非对映选择性的起源可以通过铝中心与呋喃的羰基和氧的螯合来解释。当吡咯用作二烯时,获得了弗里德尔-克拉夫茨型产品。