Cyclization−Cycloaddition Cascade of Rhodium Carbenoids Using Different Carbonyl Groups. Highlighting the Position of Interaction
作者:Albert Padwa、Zhijia J. Zhang、Lin Zhi
DOI:10.1021/jo000378f
日期:2000.8.1
carboxylate, were found to afford oxabicyclic dipolar cycloadducts derived by the trapping of a carbonyl ylide intermediate. The reaction involves generation of the 1,3-dipole by intramolecular cyclization of the keto carbenoid onto the oxygen atom of the neighboring keto group. Both five- and six-ring carbonyl ylides are formed with the same efficiency. A study of the tandem cyclization-cycloaddition
当用催化量的羧酸铑(II)处理时,发现一系列3-重氮烷二酮可提供通过捕获羰基内酯中间体而衍生的恶双环二极性环加合物。该反应涉及通过将酮类胡萝卜素分子内环化到相邻酮基的氧原子上来产生1,3-偶极。五环和六环羰基烷基化物以相同的效率形成。还对几种α-重氮酮酸酯的串联环化-环加成级联进行了研究,并且级联序列以高收率进行。当相互作用的酮羰基被亚氨基取代时,铑(II)催化的反应进行得不均匀。相反,在用Rh(II)催化剂处理时,α-重氮酰胺基酯不会进行氮挤出。代替,