98991-09-4Relevant articles and documents
Remarkable switch in the regiochemistry of the iodination of anilines by N-iodosuccinimide: Synthesis of 1,2-dichloro-3,4-diiodobenzene
Shen, Hao,Vollhardt, K. Peter C.
supporting information; experimental part, p. 208 - 214 (2012/03/11)
Direct iodination of anilines by NIS in polar solvents (such as DMSO) affords p-iodinated products with up to >99% regioselectivity. Switching to less polar solvents (such as benzene) in the presence of AcOH inverts this outcome toward dramatically increased or preferential generation of the o-isomers, also with up to >99% regioselectivity. This finding was exploited in the synthesis of 1,2-dichloro-3,4-diiodobenzene. Georg Thieme Verlag Stuttgart - New York.
Solvent-free Heck-Jeffery reactions under ball-milling conditions applied to the synthesis of unnatural amino acids precursors and indoles
Tullberg, Erik,Schacher, Felix,Peters, Dan,Frejd, Torbjoern
, p. 1183 - 1189 (2007/10/03)
The syntheses of various amino- and hydroxy-substituted dehydrophenylalanine derivatives using the Heck-Jeffery protocol under non-solvent conditions in a ball mill are presented. The influences of electron-withdrawing groups and of the location of the heteroatom substituent relative to the halide are discussed. Suitably substituted ortho-amino dehydrophenylalanine derivatives undergo a cyclization-elimination reaction to the corresponding 2-substituted indoles. Georg Thieme Verlag Stuttgart.
The Synthesis and Ionization of Some Derivatives of 1-Biphenylenol
Hine, Jack,Hahn, Soonkap,Miles, David E.,Ahn, Kyunghye
, p. 5092 - 5096 (2007/10/02)
2,7-Dimethyl-1,8-biphenylenediol has been synthesized from 2-methyl-5-nitrophenol in nine steps. 1,5-Biphenylenediol has been prepared by dimerization of 3-methoxybenzyne, separation of isomers, and demethylation. 8-Methoxy-1-biphenylenol has been made by the partial demethylation of 1,8-dimethoxybiphenylene.Ionization constants (pK1 8.04, pK2 11.47, pK1 8.35, pK2 9.97, and pK 9.15, respectively) have been determined for these compounds and for 1,8-biphenylenediol (pK1 8.01, pK2 11.00) and 1- biphenylenol (pK 8.64) by ultraviolet spectrophotomeric measurements in aqueous solution.