Chemistry of pyrrolizines; reactions with cyanogen bromide and trifluoroacetic anhydride
作者:W. Verboom、G.W. Visser、D.N. Reinhoudt
DOI:10.1016/0040-4020(82)80259-7
日期:1982.1
pyrrolizine 3 with cyanogen bromide in a tetrahydrofuran/water mixture affords addition to the enamine double bond with formation of 5 which can be aromatized to 6 by silica gel. Reaction of 6 with cyanogen bromide in the same solvent mixture yields the indoline 8a which structure is proved in a chemical way by conversion of the product into the aldehyde 8d. The different reaction pathway is discussed
吡咯嗪3与溴化氰在四氢呋喃/水混合物中的相互作用提供了烯胺双键,形成了5,可被硅胶芳构化为6。的反应6与溴化氰在相同的溶剂混合物产生了二氢吲哚8a中其结构以化学方式通过转化产物的成醛证明8D。关于酯基的空间位阻,讨论了不同的反应途径。用三氟乙酸酐处理6得到三氟乙酰化的化合物11。空间位的去除阻的酯基在6与乙酸在200°C的喹啉溶液中同时脱羧,得到吡咯并[1,2- a ]吲哚13。