The Article related to heteroaromatic compound cyanation hypervalent iodine cyanide, Heterocyclic Compounds (One Hetero Atom): Indoles, Indolizines, Carbazoles, and Other Arenopyrroles and other aspects.SDS of cas: 144970-30-9
On January 5, 2007, Dohi, Toshifumi; Morimoto, Koji; Takenaga, Naoko; Goto, Akihiro; Maruyama, Akinobu; Kiyono, Yorito; Tohma, Hirofumi; Kita, Yasuyuki published an article.SDS of cas: 144970-30-9 The title of the article was Direct Cyanation of Heteroaromatic Compounds Mediated by Hypervalent Iodine(III) Reagents: In Situ Generation of PhI(III)-CN Species and Their Cyano Transfer. And the article contained the following:
Hypervalent iodine(III) reagents mediate the direct cyanating reaction of a wide range of electron-rich heteroaromatic compounds such as pyrroles, thiophenes, and indoles under mild conditions (ambient temperature), without the need for any prefunctionalization. Com. available trimethylsilyl cyanide is usable as a stable and effective cyanide source, and the reaction proceeds in a homogeneous system. The N-substituent of pyrroles is crucial to avoid the undesired oxidative bipyrrole coupling process, and thus a cyano group was introduced selectively at the 2-position of N-tosylpyrroles in good yields using the combination of phenyliodine bis(trifluoroacetate) (PIFA), TMSCN, and BF3路Et2O at room temperature In the reaction mechanism, cation radical intermediates of heteroaromatic compounds are involved as a result of single electron oxidation, and the key to successful transformations seems to depend on the oxidation potential of the substrates used. Thus, the reaction was also successfully extended to other heteroaromatic compounds having oxidation potentials similar to that of N-tosylpyrroles such as thiophenes and indoles. However, regioisomeric mixtures of the products derived from the reaction at the 2- and 3-positions were obtained in the case of N-tosylindole. Further investigation provided insights into the real active iodine(III) species during the reaction; the reaction is induced by an active hypervalent iodine(III) species having a cyano ligand in situ generated by ligand exchange reaction at the iodine(III) center between trifluoroacetoxy group in PIFA and TMSCN, and effective cyanide introduction into heteroaromatic compounds is achieved by means of the high cyano transfer ability of the hypervalent iodine(III)-cyano intermediates. In fact, the reaction of N-tosylpyrrole with a hypervalent iodine(III)-cyano compound (e.g., (dicyano)iodobenzene), in the absence of TMSCN, took place to afford the 2-cyanated product in good yield, and an effective preparation of the intermediates is of importance for successful transformation. 1,3,5,7-Tetrakis[4-{bis(trifluoroacetoxy)iodo}phenyl]adamantane, a recyclable hypervalent iodine(III) reagent, was also comparable in the cyanating reactions as a valuable alternative to PIFA, affording a high yield of the heteroaromatic cyanide by facilitating isolation of the cyanated products with a simple workup. Accordingly, after preparing the active hypervalent iodine(III)-CN species by premixing of a recyclable reagent, TMSCN, and BF3路Et2O for 30 min in dichloromethane, reaction of a variety of pyrroles and thiophenes provided the desired cyanated products and in high yields. 1,3,5,7-Tetrakis[4-iodophenyl]adamantane, recovered by filtration after replacement of the reaction solvent to MeOH, could be reused without any loss of activity (the oxidant can be obtained nearly quant. by reoxidation using m-CPBA). The experimental process involved the reaction of 1,3,5,7-Tetrakis(4-iodophenyl)adamantane(cas: 144970-30-9).SDS of cas: 144970-30-9
The Article related to heteroaromatic compound cyanation hypervalent iodine cyanide, Heterocyclic Compounds (One Hetero Atom): Indoles, Indolizines, Carbazoles, and Other Arenopyrroles and other aspects.SDS of cas: 144970-30-9
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com