Anodic Cyclization of Dimethyl 2-(3-Oxo-3-arylpropyl) Malonates into the Corresponding Dimethyl 2-Aroylcyclopropane-1,1-dicarboxylates
摘要:
A variety of dimethyl 2-(3-oxo-3-arylpropyl)malonates were electrooxidized in methanol, in the presence of potassium iodide and a base or a neutral salt, to give the corresponding cyclized dimethyl 2-aroylcyclopropane-1,1-dicarboxylates in moderate to good yields. The reactions were carried out under extremely mild reaction conditions, in which the optimal amount of electrolytic current varied from 2.12-2.41 F.mol(-1) depending on the substrates. The reaction presumably proceeds via a two-electron oxidation process, in which iodide ions play an important role as the electron carrier between the anode and the substrate.
In this paper, a new type of δ-vinylvalerolactone was designed and synthesized, and used as a new precursor in Pd-catalyzed [6+3] cycloaddition with azomethine imines, leading to nine-membered 1,2-dinitrogen-containing heterocycles in 77–98% yields with >20 : 1 d.r. These nine-membered ring-fused products were further transformed into unusual tetracyclic bridged-ring compounds without loss of the
本文设计合成了一种新型的δ-乙烯基戊内酯,并作为新的前驱体用于Pd催化的[6+3]与偶氮甲亚胺的环加成反应,生成了9元1,2-含二氮杂环。 77–98% 产率,>20 : 1 dr 这些九元环稠合产物进一步转化为不寻常的四环桥环化合物,而不会损失非对映选择性。