Surprising 1,7-cyclization of vinyl carbonyl ylides generated from reaction of indanetrione with vinyl diazo compounds
作者:Masashi Hamaguchi、Kazuma Takahashi、Takumi Oshima、Hatsue Tamura
DOI:10.1016/s0040-4039(03)00936-5
日期:2003.6
3-dione-2,2′-benzodihydrooxepin 7a,b,c, but not normal products oxirane and dihydrofuran derivatives expected from intermediate vinyl carbonyl ylides 4. Formation of 7 requires isomerization of vinyl carbonyl ylides 4 bearing a (Z)-cyanostyryl group to unstable (E)-form 5 and subsequent cyclization to oxepin 6 followed by a 1,5-hydrogen shift. However, reaction of 2 with six-membered cyclic tricarbonyl
进行了三羰基化合物与乙烯基重氮化合物2的反应。1,2,3-茚满三酮与2a,b,c反应得到螺环1,3-二酮-2,2'-苯并二氢氧杂庚酸酯7a,b,c,但不是正常产物环氧乙烷和二氢呋喃衍生物,可从中间体乙烯基羰基化合物中获得叶利德4。7的形成需要将带有(Z)-氰基苯乙烯基的乙烯基羰基乙烯基化合物4异构化为不稳定的(E)-形式5,然后环化为oxepin 6然后是1,5-氢转移。然而,2与六元环状三羰基化合物1,2,3-三氧代-2,3-二氢苯并萘11和二甲基四氧六环13的反应分别得到二氧杂环戊烯12和二氢呋喃14,这是乙烯基羰基羰基化合物所期望的典型产物。