Rh(III)-催化的 2-重氮-1,3-二酮与 1,3-二羰基化合物的级联亲核加成/环化以获得 6,7-二氢苯并呋喃-4(5 H )-酮
摘要:
2-重氮-1,3-二酮与1,3-二羰基化合物(例如1,3-二酮和β-酮酯)的Rh(III)催化级联亲核加成/分子内环化得到6, 7-dihydrobenzofuran-4(5 H )-ones 的产率高达 91%。值得注意的是,在优化的反应条件下,广泛的底物和官能团具有良好的耐受性,以中等至优异的产率得到所需产物,同时释放出 N 2和 H 2 O 作为副产物。此外,所描述的方法是可扩展的,适用于后期功能化。
AbstractAn efficient manganese dioxide‐mediated and highly selective oxidative CH/CH functionalization of 1,3‐dicarbonyl compounds with α,β‐unsaturated ketones for the construction of tetrasubstituted furans in one step has been demonstrated. This catalytic system converts two CH bonds and CO bonds to CC and CO bonds. This reaction provides a facile and regio‐defined method for the synthesis of 3,4‐dicarbonyl substituted furans.magnified image
Here, we have reported synthesis of 3,4-dicarbonyl substituted poly-functionalized furan derivatives via direct functionalization of α,β-unsaturated carbonyl compounds through conjugate addition initiated dominoreactions using CuO nanoparticles as a reusable catalyst in aqueous ethanol.