N-Iodosuccinimide (NIS) is an iodinating agent that is used for various electrophilic iodinations and as source for iodine in radical reactions.
Various methoxy- or methyl-substituted aromatic compounds were regioselectively iodinated with N-iodosuccinimide and a catalytic amount of trifluoroacetic acid with excellent yields under mild conditions and short reaction times.
A.-S. Castanet, F. Colobert, P.-E. Broutin, Tetrahedron Lett., 2002, 43, 5047-5048.
N-Halosuccinimides are efficiently activated in trifluoromethanesulfonic acid and BF3-H2O, allowing the halogenations of deactivated aromatics. BF3-H2O is more economic, easy to prepare, nonoxidizing, and offers sufficiently high acidity.
G. K. S. Prakash, T. Mathew, D. Hoole, P. M. Esteves, Q. Wang, G. Rasul, G. A. Olah, J. Am. Chem. Soc., 2004, 126, 15770-15776.
Use of the powerful Lewis acid, iron(III) triflimide, generated in situ from iron(III) chloride and a readily available triflimide-based ionic liquid allowed activation of N-iodosuccinimide (NIS) and efficient iodination of a wide range of arenes under mild conditions.
D. T. Racys, C. E. Warrilow, S. L. Pimlott, A. Sutherland, Org. Lett., 2015, 17, 4782-4785.
In a mild and rapid method for the iodination of arenes, silver(I) triflimide is used as a catalyst for activation of N-iodosuccinimide. The is suitable for a wide range of anisoles, anilines, acetanilides, and phenol derivatives and allowed the late-stage iodination of biologically active compounds.
D. T. Racys, S. A. I. Sharif, S. L. Pimlott, A. Sutherland, J. Org. Chem., 2016, 81, 772-780.
The use of a hexafluoroisopropanol as solvent enables a mild and regioselective halogenation of a broad range of arenes and heterocycles with N-halosuccinimides in good yields. In addition, the versatility of the method is demonstrated by the development of one-pot sequential dihalogenation and halogenation-Suzuki cross-coupling reactions.
R.-J. Tang, T. Milcent, B. Crousse, J. Org. Chem., 2018, 83, 930-938.
A highly para-selective halogenation of arenes bearing electron-donating coordinating groups in the presence of a dimidazolium salt rpovides p-haloarenes in good yields. A plausible mechanism for the catalytic reaction is proposed.
J. Chen, X. Xiong, Z. Chen, J. Huang, Synlett, 2015, 26, 2831-2834.
Gold(I) catalysis enables an efficient iodination of a various electron-rich arenes in the presence of N-Iodosuccinimide (NIS) under mild conditions.
D. Leboeuf, J. Ciesielsk, A. J. Frontier, Synlett, 2014, 25, 399-402.
A convenient and efficient visible-light-induced decarboxylative iodination of aromatic carboxylic acids provides the corresponding aryl iodides in good yields. The method offers simple and mild conditions, high efficiency, wide substrate scope and tolerates various functional groups.
M. Jiang, H. Yang, Y. Jin, L. Ou, H. Fu, Synlett, 2018, 29, 1572-1577.
Aryl and heteroaryl boronic acids react with N-iodosuccinimide and N-bromosuccinimide to give the corresponding iodo- and bromo-arenes in good to excellent yields. The reaction is usually highly regioselective and yields only the ipso-substituted product.
C. Thiebes, G. K. Surya Prakash, N. A. Petasis, G. A. Olah, Synlett, 1998, 141-142.
Using cyano as the directing group, a palladium-catalyzed ortho-halogenation (I, Br, Cl) reaction gave good to excellent yields. The method is compatible to arylnitriles with either electron-withdrawing or electron-donating groups. The present method was successfully applied to the synthesis of the precursors of paucifloral F and isopaucifloral F.
B. Du, X. Jiang, P. Sun, J. Org. Chem., 2013, 78, 2786-2791.
Reliable, operationally simple, catalytic α-selective hydroalumination reactions proceed in the presence of diisobutylaluminum hydride and (Ni(dppp)Cl2), and, unlike uncatalyzed transformations, generate little or no alkynylaluminum byproducts. The derived α-vinyl halides and boronates can be synthesized through direct treatment with the appropriate electrophiles.
F. Gao, A. H. Hoveyda, J. Am. Chem. Soc., 2010, 132, 10961-10963.
Trapping of a diazo species in an intermolecular fashion by two independent ion species in tandem at the carbene center installs an electrophile and a nucleophile on the same carbon. This metal-free concept enables regioselective syntheses of various vinyl halides, vinyl sulfones, and alkyne derivatives.
D. P. Ojha, K. R. Prabhu, Org. Lett., 2015, 17, 18-21.
Using triethylamine as catalyst in Hunsdiecker reactions with N-halosuccinimides as Br+ or I+ source, cinnamic acids, and propiolic acids are converted to the corresponding α-halostyrenes and 1-halo-1-alkynes in good isolated yields within 1-5 min.
J. Prakash, S. Roy, J. Org. Chem., 2002, 67, 7861-7864.
An efficient protocol for a highly stereoselective one-pot synthesis of (E)-β-aryl vinyl iodides and (E)-β-aryl vinyl bromides from styrenes is based on a ruthenium-catalyzed silylative coupling followed by a N-halosuccinimide-mediated halodesilylation reaction.
P. Pawluć, G. Hreczycho, J. Szudkowska, M. Kubicki, B. Marciniec, Org. Lett., 2009, 11, 3390-3393.
A direct asymmetric iodination reaction of aldehydes with NIS catalyzed by a novel axially chiral bifunctional amino alcohol represents a rare example of a highly enantioselective synthesis of optically active α-iodoaldehydes.
T. Kano, M. Ueda, K. Maruoka, J. Am. Chem. Soc., 2008, 130, 3728-3729.
An efficient synthesis of α-iodo/bromo-α,β-unsaturated aldehydes/ketones directly from propargylic alcohols is catalyzed collaboratively by Ph3PAuNTf2 and MoO2(acac)2, and Ph3PO as an additive helps suppress undesired enone/enal formation. Notable features of this method include low catalyst loadings, mild reaction conditions, and mostly good diastereoselectivity.
L. Ye, L. Zhang, Org. Lett., 2009, 11, 3646-3649.
A catalytic amount of Au(PPh3)NTf2 converts readily accessible propargylic acetates into versatile linear α-iodoenones in good to excellent yields. Very good Z-selectivities are observed for aliphatic propargylic acetates.
M. Yu, G. Zhang, L. Zhang, Org. Lett., 2007, 9, 2087-2090.
A regio- and stereoselective iodination, along with some examples for bromination, of readily available acrylamides proceeds under mild conditions via a Rh(III)-catalyzed C-H-activation/halogenation mechanism. The reaction represents a rare example of a direct halogenation of electron-poor acrylic acid derivatives to access a variety of differently substituted Z-haloacrylic acid derivatives.
N. Kuhl, N. Schröder, F. Glorius, Org. Lett., 2013, 15, 3860-3863.
A new silver-catalyzed highly regio- and stereoselective difunctionalization reaction of simple terminal alkynes gives (Z)-β-haloenol acetate derivatives in good yields. The resulting products are versatile intermediates in organic synthesis.
Z. Chen, J. Li, H. Jiang, S. Zhu, Y. Li, C. Qi, Org. Lett., 2010, 12, 3262-3265.
Dimethyl sulfoxide (DMSO) and N-iodosuccinimide mediate a metal-free regioselective 5-exo-dig oxidative cyclization of propargyl-substituted ynamides via in situ generated enol equivalents. The reaction allows easy access to functionalized pyrrolidone skeletons. The role of DMSO as oxidant in the transformation is clarified, and a tentative reaction pathway is proposed.
B. Prabagar, S. Nayak, R. Prasad, A. K. Sahoo, Org. Lett., 2016, 18, 3066-3069.
A sequence consisting of an electrophilic cyclization in the presence of N-iodosuccinimide (NIS) and an 1,2-migration allows the construction of 4-iodo-3-furanones from 2-alkynyl-2-silyloxy carbonyl compounds. In a more versatile variant, AuCl3 catalyzes the tandem reaction in the presence of NIS to provide highly substituted heterocycles in good yields.
B. Crone, S. F. Kirsch, J. Org. Chem., 2007, 72, 5435-5438.
Various tert-butyldimethylsilyl ethers are easily removed in excellent yields by treatment with a catalytic amount of N-iodosuccinimide in methanol. This method allows a selective deprotection of TBDMS ethers of alcohols in the presence of TBDMS ethers of phenols.
B. Karimi, A. Zamani, D. Zarayee, Tetrahedron Lett., 2004, 45, 9139-9141.
N-Iodosuccinimide promotes an attractive and productive protocol for the position-selective intramolecular C-H amination of aliphatic groups (Hofmann-Löffler reaction) employing sulfonimides as nitrogen sources initiated by visible light. The overall transformation provides pyrrolidines under mild and selective conditions as demonstrated for 17 different substrates.
C. Q. O'Broin, P. Fernández, C. Martínez, Kilian Muñiz, Org. Lett., 2016, 18, 436-439.
Use of La(OTf)3 as a Lewis acid promoter for N-iodosuccinimide-mediated activation of thioglycosides enables a smooth glycosylation reaction with good to excellent yields and stereoselectivity.
S. Mukherjee, B. Mukhopadhyay, Synlett, 2010, 2853-2856.
A sequential intermolecular hydroamination reaction of 2-trifluoromethyl-1,3-enynes with aliphatic primary amines under mild reaction conditions followed by a NXS mediated oxidative cyclization of the hydroamination product provides halogenated trifluoromethylated pyrroles. This method offers mild conditions, high efficiency, readily available starting materials, general substrate scope, and synthetic utility of the products.
C. Huang, Y. Zeng, H. Cheng, A. Hu, L. Liu, Y. Xiao, J. Zhang, Org. Lett., 2017, 19, 4968-4971.
An efficient copper-catalyzed aerobic oxidative dehydrogenative annulation of amines, alkynes, and O2 provides trisubstituted oxazoles via dioxygen activation and oxidative C-H bond functionalization.
J. Pan, X. Li, X. Qiu, X. Luo, N. Jiao, Org. Lett., 2018, 20, 2762-2765.
Highly substituted oxazoles can be synthesized from readily accessible ynamides in the presence of ytterbium(III) trifluoromethanesulfonate, N-iodosuccinimide, and acetonitrile. Hydroamidation and iodo-imidation of ynamides to ketene aminals are also demonstrated. The reactions are scalable to the gram scale, testifying the robustness of the transformations.
A rapid synthesis of indoles from N-Ts-2-alkenylanilines involves a NIS-mediated cascade C-N bond formation/aromatization. A series of indoles with various functional groups have been synthesized in very good yields under mild conditions without any other additives or catalysts.
Y.-L. Li, J. Li, A.-L. Ma, Y.-N. Huang, J. Deng, J. Org. Chem., 2015, 80, 3841-3851.
Gold(I)-catalyzed cycloisomerization of 1-(2-(tosylamino)phenyl)prop-2-yn-1-ols enables the preparation of 1H-indole-2-carbaldehydes and (E)-2-(iodomethylene)indolin-3-ols in the presence of N-iodosuccinimide (NIS). The reactions were shown to be operationally simplistic and proceed efficiently for a wide variety of substrates, affording the corresponding products in very good yields.
P. Kothandaraman, S. R. Mothe, S. S. M. Toh, P. W. H. Chan, J. Org. Chem., 2011, 76, 7633-7640.
A metal-free sequential dual oxidative amination of C(sp3)-H bonds under ambient conditions affords imidazo[1,5-a]pyridines in very good yields. The reaction involves two oxidative C-N couplings and one oxidative dehydrogenation process with six hydrogen atoms removed.
Y. Yan, Y. Zhang, Z. Zha, Z. Wang, Org. Lett., 2013, 15, 2274-2277.
A gold-catalyzed cyclization of β-amino-ynone intermediates and halodeauration process enables a rapid and efficient one-step halopyridone synthesis.
K. H. Nguyen, S. Tomasi, M. Le Roch, L. Toupet, J. Renault, P. Uriac, N. Gouault, J. Org. Chem., 2013, 78, 7809-7815.
Treatment of N-tosyl-2-propynylamines with diphenyliodonium triflate in the presence of K3PO4 and a catalytic amount of CuCl at room temperature followed by N-iodosuccinimide and BF3·OEt2 at 0°C, and then NaOH in methanol solution provided 3-iodo-4-arylquinolines. Products underwent various cross-coupling reactions and were smoothly dehalogenated with zinc.
T. Sasaki, K. Moriyama, H. Togo, J. Org. Chem., 2017, 82, 11727-11734.
The intramolecular cyclization of 1-azido-2-(2-propynyl)benzene proceeds smoothly in the presence of electrophilic reagents in CH3NO2 at room temperature or in the presence of catalytic amounts of AuCl3/AgNTf2 in THF at 100°C to afford the corresponding quinolines 2 in good to high yields.
Z. Huo, I. D. Gridnev, Y. Yamamoto, J. Org. Chem., 2010, 75, 1266-1270.
A convenient radical oxidative cyclization mediated by N-iodosuccinimide (NIS) enables the synthesis of a series of dibenzopyranones from a wide scope of 2-arylbenzoic acids. The methodology offers good functional group tolerance and mild reaction conditions without the use of transition metals.
P. Gao, Y. Wei, Synthesis, 2014, 46, 343-347.