An unprecedented cascade reaction of isocyanide and methyleneindolinone has been established, which represents a novel and different reaction mode. This present transformation involves the ring-opening of methyleneindolinone and the construction of two other new rings simultaneously in an atom-economic manner.
BF<sub>3</sub>·OEt<sub>2</sub> Mediated Regioselective Reaction of Electron-Rich Arenes with 3-Ylidene Oxindoles
作者:Nitika Sharma、Rama Krishna Peddinti
DOI:10.1021/acs.joc.6b02395
日期:2017.1.20
A BF3·OEt2 mediated novel and regioselective protocol for the construction of a C–C bond between 3-ylidene oxindoles and electron-rich arenes has been successfully accomplished. The reaction was compatible with a wide variety of electron-rich arenes. A cascade reaction of 3-ylidene oxindoles with phenols and β-naphthol resulted in 2,3-difunctionalized benzofuran and lactone bearing indoline-2-one scaffolds
A New [2+2+1] Heterocyclization for the Synthesis of 2,3,5-Trisubstituted Thiophenes under Microwave Irradiation
作者:Bo Jiang、Shu-Jiang Tu、Hai-Wei Xu、Guan-Hua Ma
DOI:10.1055/s-0033-1339917
日期:——
Abstract A new three-component strategy for the efficient synthesis of 2,3,5-trisubstituted thiophene derivatives through a [2+2+1] heterocyclization between 3-(2-aryl-2-oxoethylidene)-2-oxindoles and α-thiocyanato ketones under microwave irradiation is described. The bond-forming efficiency, accessibility, and generality of this synthesis make it highly valuable to assemble thiophene scaffolds. A new three-component
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