1) Metal element in pharmaceutical compounds: (a) S. J. Stohs, D. Bagchi, Free Radical Biology and Medicine, 1995, 18, 321; (b) K. S. Kasprzak, Free Radical Biology & Medicine, 2002, 32, 958; (c) P.J. Dunn, A. S. Wells, M. T. Williams, “Future Trends for Green Chemistry in the Pharmaceutical Industry (Chapter 16)”, Green Chemistry in the Pharmaceutical Industry, 2010, 333; (d) V. Mudgal,N. Madaan, A. Mudgal, R.B. Singh, S. Mishra, The Open Nutraceuticals Journal, 2010, 3, 94; (e) M. Jaishankar, T. Tseten, N. Anbalagan, B. B. Mathew, K. N. Beeregowda, Interdiscip Toxicol. 2014, 7, 60.
2) Rundle-Pimentel 3c-4e model for hypervalent bond: (a) G. C. Pimentel, J. Chem. Phys. 1951, 19, 446; (b) R. J. Hach, R. E. Rundle, J. Am. Chem. Soc. 1951, 73, 4321; (c) J. I. Musher, Angew. Chem. Int. Ed. 1969, 8, 54.
3) The first discovery of hypervalent iodine compound: C. Willgerodt, J. Prakt. Chem. 1886, 33, 154.
4) Recent reviews for hypervalent iodine chemistry: (a) M. Ochiai, K. Miyamoto, Eur. J. Org. Chem.2008, 4229; (b) T. Dohi, Y. Kita, Chem. Commun. 2009, 2073; (c) V. V. Zhdankin, ARKIVOC 2009, 1,1; (d) M. Uyanik, K. Ishihara, Chem. Commun. 2009, 2086; (e) A. Duschek, S. F. Kirsch, Angew. Chem. Int. Ed. 2011, 50, 1524; (f) Y. Kita, T. Dohi, K. Morimoto, J. Synth. Org. Chem., Jpn. 2011, 69, 1241; (g) D. F. González, F. Benfatti, J. Waser, ChemCatChem 2012, 4, 955; (h) M. S. Yusubov, V. V. Zhdankin, Curr. Org. Synth. 2012, 9, 247; (i) V. V. Zhdankin, J. D. Protasiewicz, Coord. Chem. Rev. 2014, 275, 54; (j) A. Yoshimura, V. V. Zhdankin, Chem. Rev. 2016, 116, 3328.
5) Review for hypervalent iodine(V) reagents: U. Ladziata, V. V. Zhdankin, ARKIVOC 2006, 26.
6) Dess-Martin periodinane (DMP): (a) D. B. Dess, J. C. Martin, J. Org. Chem. 1983, 48, 4155; (b) D.B. Dess, J. C. Martin, J. Am. Chem. Soc. 1991, 113, 7277; (c) S. D. Meyer, S. L. Schreiber, J. Org. Chem. 1994, 59, 7549; (d) P. J. Stevenson, A. B. Treacy, M. Nieuwenhuyzen, J. Chem. Soc., Perkin Trans. 2 1997, 589; (e) S. S. Chaudhari, K. G. Akamanchi, Synthesis 1999, 760.
7) 2-Iodoxybenzoic acid (IBX): (a) C. Hartmann, V. Meyer, Chem. Ber. 1893, 26, 1727; (b) M. Frigerio,M. Santagostino, Tetrahedron Lett. 1994, 35, 8019; (c) M. Frigerio, M. Santagostino, S. Sputore, G. Palmisano, J. Org. Chem. 1995, 60, 7272; (d) S. De Munari, M. Frigerio, M. Santagostino, J. Org. Chem. 1996, 61, 9272; (e) M. Frigerio, M. Santagostino, S, Sputore, J. Org. Chem. 1999, 64, 4537;(f) K. C. Nicolaou, Y.-L. Zhong, P. S. Baran, J. Am. Chem. Soc. 2000, 122, 7596; (g) K. C. Nicolaou,P. S. Baran, Y.-L. Zhong, J. Am. Chem. Soc. 2001, 123, 3183; (h) K. C. Nicolaou, T. Montagnon, P. S. Baran, Y.-L. Zhong, J. Am. Chem. Soc. 2002, 124, 2245; (i) J. N. Moorthy, N. Singhal, K. Senapati, Org. Biomol. Chem. 2007, 5, 767.
8) Stabilized IBX (SIBX): (a) A. Ozanne, L. Pouységu, D. Depernet, B. François, S. Quideau, Org. Lett. 2003, 5, 2903-2906; (b) S. Quideau, L. Pouysegu, D. Deffieux, A. Ozanne, J. Gagnepain, I. Fabre,M. Oxoby, ARKIVOC 2003, 6, 106-119; (c) A. Ozanne-Beaudenon, S. Quideau, Tetrahedron Lett.2006, 47, 5869.
9) IBX derivatives: (a) V. V. Zhdankin, A. Y. Koposov, B. C. Netzel, N. V. Yashin, B. P. Rempel, M. J. Ferguson, R. R. Tykwinski, Angew. Chem. Int. Ed. 2003, 42, 2194; (b) V. V. Zhdankin, A. Y. Koposov,D. N. Litvinov, M. J. Ferguson, R. McDonald, T. Luu, R. R. Tykwinski, J. Org. Chem. 2005, 70, 6484;(c) U. Ladziata, A. Y. Koposov, K. Y. Lo, J. Willging, V. N. Nemykin, V. V. Zhdankin, Angew. Chem. Int. Ed. 2005, 44, 7127-7131; (d) U. Ladziata, J. Willging, V. V. Zhdankin, Org. Lett. 2006, 8, 167; (e)A. Y. Koposov, R. R. Karimov, I. M. Geraskin, V. N. Nemykin, V. V. Zhdankin, J. Org. Chem. 2006, 71, 8452; (f) A. Y. Koposov, D. N. Litvinov, V. V. Zhdankin, M. J. Ferguson, R. McDonald, R. R. Tykwinski, Eur. J. Org. Chem. 2006, 4791.
10) Oxidation reaction using hypervalent iodine(III) reagents reported by Kita’s group: (a) Y. Tamura,T. Yakura, J. Haruta, Y. Kita, J. Org. Chem. 1987, 52, 3927; (b) Y. Kita, H. Tohma, K. Kikuchi, M. Inagaki, T. Yakura, J. Org. Chem. 1991, 56, 435; (c) Y. Kita, H. Tohma, K. Hatanaka, T. Takada, S. Fujita, S. Mitoh, H. Sakurai, S. Oka, J. Am. Chem. Soc. 1994, 116, 3684; (d) Y. Kita, T. Takada, S. Mihara, B. A. Whelan, H. Tohma, J. Org. Chem. 1995, 60, 7144; (e) Y. Kita, T. Takada, H. Tohma, Pure & Appl. Chem. 1996, 68, 627; (f) T. Takada, M. Arisawa, M. Gyoten, R. Hamada, H. Tohma, Y. Kita, J. Org. Chem. 1998, 63, 7698; (g) M. Arisawa, S. Utsumi, M. Nakajima, N. G. Ramesh, H. Tohma, Y. Kita, Chem. Commun. 1999, 469; (h) H. Tohma, H. Watanabe, S. Takizawa, T. Maegawa,Y. Kita, Heterocycles 1999, 51, 1785; (i) M. Arisawa, N. G. Ramesh, M. Nakajima, H. Tohma, Y. Kita,J. Org. Chem. 2001, 66, 59; (j) H. Hamamoto, G. Anilkumar., H, Tohma, Y. Kita, Chem. Eur. J. 2002,8, 5377; (k) H. Tohma, M. Iwata, T. Maegawa, Y. Kita, Tetrahedron Lett. 2002, 43, 9241; (l) H. Tohma,Y. Kita, Top. Curr. Chem. 2003, 224, 209; (m) H. Hamamoto, Y. Shiozaki, H. Nambu, K. Hata, H. Tohma, Y. Kita, Chem. -Eur. J. 2004, 10, 4977; (n) T. Dohi, A. Maruyama, M. Yoshimura, K. Morimoto,H. Tohma, Y. Kita, Angew. Chem. Int. Ed. 2005, 44, 6193; (o) T. Dohi, A. Maruyama, Y. Minamitsuji,N. Takenaga, Y. Kita, Chem. Commun. 2007, 43, 1224; (p) T. Dohi, Y. Minamitsuji, A. Maruyama, S. Hirose, Y. Kita, Org. Lett. 2008, 10, 3559; (q) T. Dohi, A. Maruyama, N. Takenage, K. Senami, Y. Minamitsuji, H. Fujioka, S. B. Cämmerer, Y. Kita, Angew. Chem. Int. Ed. 2008, 47, 3787; (r) T. Dohi,M. Ito, N. Yamaoka, K. Morimoto, H. Fujioka, Y. Kita, Tetrahedron 2009, 65, 10797; (s) T. Dohi, N. Yamaoka, Y. Kita, Tetrahedron 2010, 66, 5775; (t) T. Dohi, T. Nakae, Y. Ishikado, D. Kato, Y. Kita, Org. Biomol. Chem. 2011, 9, 6899; (u) Y. Hu, T. Kamitanaka, Y. Mishima, T. Dohi, Y. Kita, J. Org. Chem. 2013, 78, 5530; (v) T. Dohi, N. Takenaga, T. Nakae, Y. Toyoda, M. Yamasaki, M. Shiro, H. Fujioka, A. Maruyama, Y. Kita, J. Am. Chem. Soc. 2013, 135, 4558.
11) Total synthesis of natural products using hypervalent iodine(III) reagents reported by Kita’s group:(a) Y. Kita, T. Yakura, H. Tohma, K. Kikuchi, Y. Tamura, Tetrahedron Lett. 1989, 30, 1119; (b) Y. Kita,H. Tohma, M. Inagaki. K. Hatanaka, K. Kikuchi, T. Yakura, Tetrahedron Lett. 1991, 32, 2035; (c) Y. Kita, H. Tohma, M. Inagaki, K. Hatanaka, T. Yakura, J. Am. Chem. Soc. 1992, 114, 2175; (d) Y. Kita,T. Takada, M. Gyoten, H. Tohma, M. H. Zenk, J. Eichhorn, J. Org. Chem. 1996, 61, 5857; (e) Y. Kita,M. Arisawa, M. Gyoten, M. Nakajima, R. Hamada, H. Tohma, T. Takada, J. Org. Chem. 1998, 63, 6625; (f) H. Tohma, Y. Harayama, M. Hashizume, M. Iwata, M. Egi, Y. Kita, Angew. Chem. Int. Ed. 2002, 41, 348; (g) H. Tohma, Y. Harayama, M. Hashizume, M. Iwata, Y. Kiyono, M. Egi, Y. Kita, J. Am. Chem. Soc. 2003, 125, 11235.
12) Oxidative cross-coupling of two aromatic rings: (a) H. Tohma, H. Morioka, S. Takizawa, M. Arisawa, Y. Kita, Tetrahedron 2001, 57, 345; (b) T. Dohi, M. Ito, K. Morimoto, M. Iwata, Y. Kita, Angew. Chem. Int. Ed. 2008, 47, 1301.
13) Discovery of cation radical species: Y. Kita, H. Tohma, K. Hatanaka, T. Takada, S. Fujita, S. Mitoh,H. Sakurai, S. Oka, J. Am. Chem. Soc. 1994, 116, 3684.
14) Diaryliodonium salts-mediated cross-coupling reaction: (a) Y. Kita, K. Morimoto, M. Ito, C. Ogawa, A. Goto, T. Dohi, J. Am. Chem. Soc. 2009, 131, 1668; (b) T. Dohi, M. Ito, N. Yamaoka, K. Morimoto, H. Fujioka, Y. Kita, Angew. Chem. Int. Ed. 2010, 49, 3334; (c) K. Morimoto, N. Yamaoka,C. Ogawa, T. Nakae, H. Fujioka, T. Dohi, Y. Kita, Org. Lett. 2010, 12, 3804.
15) Reviews for diaryliodonium salts: (a) F. M. Beringer, M. Drexler, E. M. Gindler, C. C. Lumpkin,J. Am. Chem. Soc. 1953, 75, 2708 (Seminal Study); (b) E. A. Merritt, B. Olofsson, Angew. Chem. Int. Ed. 2009, 48, 9052; (c) K. Aradi, B. L. Tóth, G. L. Tolnai1, Z. Novák, Synlett 2016, 27, 1456; (d) A. Yoshimura, A. Saito, V. V. Zhdankin, Chem. Eur. J. 2018, 24, 15156.
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19) マナック(株)研究所 著 (鈴木仁美 監修), “臭素及びヨウ素化合物の有機合成 2.16 高原子価ヨウ素化合物”, 丸善出版, 2017 年, p 608.
20) The first hypervalent iodine-mediated reaction for the synthesis of diaryliodonium salts in fluoroalcohol media. (a) T. Dohi, M. Ito, K. Morimoto, Y. Minamitsuji, N. Takenaga, Y. Kita, Chem. Commun. 2007, 40, 4152; (b) T. Dohi, N. Yamaoka, Y. Kita, Tetrahedron 2010, 66, 5775.
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23) Metal-free one-pot O-arylation of carboxylic acids by in situ generated TMP iodonium carboxylates: T. Dohi, D. Koseki, K. Sumida, K. Okada, S. Mizuno, A. Kato, K. Morimoto, Y. Kita, Adv. Synth. Catal. 2017, 359, 3503.
24) Cu-catalyzed N-arylation of azoles using TMP iodonium salts: D. Koseki, E. Aoto, T. Shoji, K. Watanabe, Y. In, Y. Kita, T. Dohi, Tetrahedron Lett. 2019, 60, 1281.
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36) 4-Methoxyphenyl (anisyl) iodonium salts: (a) M.-R. Zhang, K. Kumata, K. Suzuki, Tetrahedron Lett. 2007, 48, 8632-; (b) X.-H. Li, L.-G. Li, X.-L. Mo, D.-L. Mo, Synth. Commun. 2016, 46, 963.
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