Amination of Bis(trimethylsilyl)-1,2-bisketene with Secondary Amines: Formation of Aminodihydrofuranones
作者:Annette D. Allen、Wen-wei Huang、Patrick A. Moore、Adel Rafai Far、Thomas T. Tidwell
DOI:10.1021/jo000508k
日期:2000.9.1
morpholine obeyed a rate law with the term [morpholine](2), consistent with rate-limiting formation of the enol amide 14 with catalysis by a second amine molecule. The subsequent formation of 11 is attributed to hindrance of ketonization of intermediate enol amides 14. The furanones 11 react with Me(3)SiOTf to form silyloxyfurans 16, and these react with diethyl diazodicarboxylate, forming maleamide
双烯酮(Me(3)SiC = C = O)(2)(3)与1当量的仲胺快速反应,形成氨基二氢呋喃酮11,这是唯一可观察到的产物。这与以前的研究(J. Org。Chem。1999,64,4690)相反,后者是3与伯胺的反应,其中3与1当量的胺产生了烯基酰胺4,后者缓慢环化为琥珀酰亚胺7。动力学3与吗啉的反应的速率遵循术语[吗啉](2)的速率规律,这与第二胺分子催化的烯醇酰胺14的速率限制形成相一致。随后形成11是由于阻碍了中间烯醇酰胺14的酮化作用。呋喃酮11与Me(3)SiOTf反应形成甲硅烷氧基呋喃16,并且它们与重氮二甲酸二乙酯反应,形成马来酰胺衍生物17。