3-Functionalized Tetronic Acids From Domino Rearrangement/Cyclization/Ring-Opening Reactions of Allyl Tetronates
作者:Rainer Schobert、Gary J. Gordon、Arno Bieser、Wolfgang Milius
DOI:10.1002/ejoc.200300283
日期:2003.9
Allyl tetronates 1 thermally rearrange to stable 3-(spirocyclopropyl)dihydrofuran-2,4-diones 2 (R3 = H, Aryl), which can be ring-opened with O-, N-, S- and C-nucleophiles to give 3-substituted tetronic acids 3−7. Compounds 2 with R3 = Alkyl are not isolable, but are interceptable intermediates in formal [2,3]-sigmatropic rearrangements of allyl tetronates. The vinylogous hexadienyl tetronate 17 undergoes
烯丙基四氢呋喃 1 热重排为稳定的 3-(螺环丙基)二氢呋喃-2,4-二酮 2 (R3 = H, Aryl),可与 O-、N-、S- 和 C-亲核试剂开环得到 3 -取代的特电子酸3-7。具有 R3 = 烷基的化合物 2 是不可分离的,但在烯丙基 tetronates 的形式 [2,3]-sigmatropic 重排中是可截取的中间体。乙烯基己二烯基四烯酸酯 17 经历不同的多米诺 [3,5]-重排/环化反应,得到 2H,5H-呋喃 [4,3-b]oxepin-6-one 19。 (© Wiley-VCH Verlag GmbH & Co . KGaA, 69451 德国魏因海姆, 2003)