Transition metal-free and temperature dependent one-pot access to phenanthrene-fused heterocycles <i>via</i> a 1,3-dipolar cycloaddition pathway
作者:Mokilla Ramachandra Reddy、Eerappa Rajakumara、Gedu Satyanarayana
DOI:10.1039/d3cc04473d
日期:——
, and transition metal-free one-pot protocol has been devised for the preparation of novel phenanthrene-fused pyrazoles. Notably, the overall process involved an intermolecular condensation, an intramolecular 1,3-dipolar cycloaddition, and an aromatization sequence starting from biaryl-2,2′-aldehydes bearing enoate esters with various hydrazine hydrochlorides. Notably, the sequential one-pot three-component
设计了一种多功能、操作简单、温度依赖性且不含过渡金属的一锅法来制备新型菲稠合吡唑。值得注意的是,整个过程涉及分子间缩合、分子内1,3-偶极环加成以及从带有烯酸酯的联芳基-2,2'-醛与各种盐酸肼开始的芳构化序列。值得注意的是,还实现了顺序一锅三组分操作。重要的是,还表明该方案适用于盐酸羟胺作为氮源并提供菲稠合异恶唑。值得注意的是,该方案的温度依赖性也得到了证明,这导致在稍高的温度和更长的反应时间下形成脱烷氧基羰基化菲稠合吡唑。值得注意的是,这种无金属方案有效地构建了两个 C-N 键和一个 C-C 键,并表现出广泛的底物范围。