analogue of the pyrrole insecticide pirate, are reported. Acylaminoketone salts were obtained from ketobromides in moderate to high yields and excellent purity. A number of N-tosyl pyrroles were obtained; however, formation of the target acyl tosyl pyrroles was thwarted by the stereoelectronic effects of the pyrrole substituents. During the pyrrole subunit chemistry, an interesting pyrrole derivative,
Hypervalent iodine(III): selective and efficient single-electron-transfer (SET) oxidizing agent
作者:Toshifumi Dohi、Motoki Ito、Nobutaka Yamaoka、Koji Morimoto、Hiromichi Fujioka、Yasuyuki Kita
DOI:10.1016/j.tet.2009.10.040
日期:2009.12
ethers, affording the corresponding aromatic cation radicals. Since then, hypervalent iodine(III) has been utilized as a selective and efficient SET oxidizingagent that enables a variety of direct C–H functionalizations of aromatic rings in electron-rich arenes under mild conditions. We have now extended the original method to work in a series of heteroaromatic compounds such as thiophenes, pyrroles,
Direct Approach to Multi-substituted Pyrroles from 2-Propynylamine and 1,3-Diketone or β-Keto Ester Using Bi(OTf)<sub>3</sub>Catalyst
作者:Kimihiro Komeyama、Motoyoshi Miyagi、Ken Takaki
DOI:10.1246/cl.2009.224
日期:2009.3.5
Bi(OTf)3 was found to be a good catalyst for the direct synthesis of multisubstituted pyrroles from the readily accessible 2-propynylamine and activated methylene compounds in which the bismuth played two roles: σ- and π-activations.
Novel and Direct Oxidative Cyanation Reactions of Heteroaromatic Compounds Mediated by A Hypervalent Iodine(III) Reagent
作者:Toshifumi Dohi、Koji Morimoto、Yorito Kiyono、Hirofumi Tohma、Yasuyuki Kita
DOI:10.1021/ol0476826
日期:2005.2.1
The hypervalent iodine(III) reagent phenyliodine bis(trifluoroacetate) (PIFA) mediates the selective cyanation reactions of a wide range of electron-rich heteroaromatic compounds such as pyrroles, thiophenes, and indoles under mild conditions. These reactions proceed via a cation radical intermediate, and the key for the successful transformation presumably depends on the oxidation-reduction potential
N-<i>p</i>-Toluenesulfonylpyrroles from 1,3-Dienes
作者:Peter J. Harrington、Ignacio H. Sanchez
DOI:10.1080/00397919408013816
日期:1994.1
Abstract 1,3-Dienes can be converted to N-p-toluenesulfonylpyrroles in two steps: 1) [4+2]-cycloaddition with N-sulfinyl-p-toluenesulfonamide and 2) conversion of the 3,6-dihydro-1,2-thiazine oxide adduct to a pyrrole using triethylamine-trimethylphosphite.