A zinc‐mediated α‐selective prenylation of isatin‐derived imine in a sealed tube has been developed. The method is highly efficient and operationally simple with its use of readily available prenyl bromide as the prenyl source. The obtained prenylated adduct can be further manipulated to other more complicated derivatives through cyclization or oxidation.
Stereocontrolled [3+2] Cycloaddition of Donor–Acceptor Cyclopropanes to Iminooxindoles: Access to Spiro[oxindole-3,2′-pyrrolidines]
作者:Andrey A. Akaev、Stanislav I. Bezzubov、Victor G. Desyatkin、Nataliya S. Vorobyeva、Alexander G. Majouga、Mikhail Ya. Melnikov、Ekaterina M. Budynina
DOI:10.1021/acs.joc.8b03208
日期:2019.3.15
with ester, keto, nitro, cyano etc. groups, and N-unprotected iminooxindoles. The stereospecificity of the initial SN2-like imine attack on a cyclopropane molecule together with a high diastereoselectivity of further C–C bond formation facilitate a rapid access to spiro[oxindole-3,2′-pyrrolidines] in their optically active forms. Preliminary in vitro testing of the synthesized compounds against LNCaP
通过将供体-受体环丙烷的[3 + 2]-环加成到电子贫乏的酮亚胺(亚氨基氧吲哚)上,开发了螺环[oxindole-3,2'-吡咯烷]的新型立体控制组装。该方法可有效利用常用的供体-受体环丙烷,它们经酯,酮,硝基,氰基等基团和N-未保护的亚氨基吲哚官能化。最初的S N 2样亚胺攻击环丙烷分子的立体定向性以及进一步C-C键形成的高非对映选择性,有助于快速接近其光学活性形式的螺[oxindole-3,2'-吡咯烷]。初步体外 对合成的化合物针对LNCaP(p53 +)和PC-3(p53-)细胞的测试显示,对于几种化合物作为MDM2-p53相互作用的抑制剂,它们具有很好的抗增殖活性和p53选择性指数。
“On water” synthesis of spiro-indoles via Schiff bases
作者:Siva S. Panda、Subhash C. Jain
DOI:10.1007/s00706-011-0697-x
日期:2012.8
AbstractA fast, efficient, and clean “on water” synthesis of new Schiffbases and their conversion to spiro compounds undermicrowaveirradiation, as well as in water, is reported. Indol-2,3-diones were reacted separately with various heterocyclic and aromatic amines in water at room temperature to obtain corresponding Schiffbases in high purity and yield. These were then converted into corresponding
Spirocyclische 2-Indolinone durch 1,3-dipolare Cycloaddition
作者:Albrecht Franke
DOI:10.1002/jlac.197819780505
日期:1978.7.5
3'-[1]pyrazolin]-2-onen 3, Spiro[indolin-3,1'-cyclopropan]- 2-onen 6, Spiro[indolin-3,5'- und Spiro[indolin-3,4'-[2]isoxazolin]-2-onen 8 bzw. 9 sowie Spiro[indolin-3,5'-]Δ2-1,2,4]oxadiazolin]-2-onen 11 durch1,3-dipolare Cycloadditionen von Diazoalkanen und Benzonitriloxid an 2-Oxindolin-3-ylidenessigsäureester und Isatin-β-anile wird beschrieben.
approach is described for the synthesis of spiro[piperidine-3,2'-oxindoles] in 35-82 yields with excellent stereoselectivity via the [4 + 2] cycloaddition reaction of donor-acceptor cyclobutanes with iminooxindoles in the presence of 10-30 mol% Sc(OTf)3 at room temperature. This methodology provides great potential for building spiro-heterocycle compounds from simple building blocks.