development of a rapid, highly efficient, and one-pot synthesis of C3-α-prenylated oxindoles with simple reagents is described. The process is based on zinc-mediated α-regioselective prenylation of 3-acylidene-oxindole with commercially available prenyl bromide using inexpensive CeCl3 as the catalyst. The new transformation tolerates a wide range of 3-acylidene-oxindoles, providing easy access to a variety
Dimerization of 3-(2-aryl-2-oxoethylidene)oxindoles
作者:B. V. Paponov、O. V. Shishkin、S. V. Shishkina、R. I. Zubatyuk、A. L. Kalyuzhny、V. I. Musatov
DOI:10.1007/s11172-008-0098-4
日期:2008.3
Abstract6-Aroyl-7-arylindolo[3,4-jk]phenanthridin-5(4H)-ones (2a–i) were synthesized by heating 3-(2-aryl-2-oxoethylidene)-2,3-dihydroindol-2-ones (1a–i) in DMF. Compounds 2a–i are formed via the dimerization of two molecules of unsaturated ketones 1a–i proceeding as the [2+4] cycloaddition through the formation of intermediate spiro adducts. The further Pfitzinger rearrangement, decarboxylation, and heteroaromatization
Potential anticonvulsants. V. The condensation of isatins with<i>C</i>-acetyl heterocyclic compounds
作者:F. D. Popp
DOI:10.1002/jhet.5570190327
日期:1982.5
A number of C-acetyl heterocyclic compounds were condensed with isatin and substituted isatins to give a series of 3-hydroxy-3-substituted oxindoles. The products from 2-acetylfuran and isatin, 2-acetylthiophene and isatin, and 2-acetylpyridine and 1-methylisatin were active at 100 mg/Kg in the maximal electroshock seizure test.
A formal [1 + 2 + 3] annulation of methyleneindolinones with o-alkenyl arylisocyanides has been developed for the general and efficient synthesis of both symmetrical and unsymmetrical indolo[3,2-b]carbazoles. The chemoselectivity of this domino reaction was tuned by a tethered alkenyl group, which enables successive formation of three new bonds and two rings from readily accessible starting materials
已开发了一种亚甲基吲哚酮与邻链烯基芳基异氰酸酯的正式[1 + 2 + 3]环合结构,用于对称和不对称的吲哚[3,2- b ]咔唑的常规合成。该多米诺反应的化学选择性通过束缚链烯基进行调节,该链烯基能够在一次操作中由易于接近的起始原料连续形成三个新键和两个环。此外,该方法被用作生物碱麦拉西唑C合成中的关键步骤。
Squaramide-Catalyzed Enantioselective Cascade Approach to Bispirooxindoles with Multiple Stereocenters
作者:Bo-Liang Zhao、Da-Ming Du
DOI:10.1002/adsc.201600782
日期:2016.12.22
bifunctional squaramide‐catalyzed Michael/Michael cascade reaction for the construction of spirotetrahydrofuran bispirooxindoles was developed. The products were obtained in moderate to excellent yields with excellent diastereo‐ and enantioselectivities (up to >20:1 dr, >99% ee). This straightforward process serves as a powerful method for the enantioselective construction of potentially bioactive bispirooxindoles