o-Iodoxybenzoic acid (IBX): a versatile reagent for the synthesis of N-substituted pyrroles mediated by β-cyclodextrin in water
摘要:
o-Iodoxybenzoic acid (IBX), a very mild and efficient hypervalent iodine(V) reagent, aromatizes diversely substituted 1-benzylpyrrolidines and N-substituted L-proline analogues to the corresponding substituted pyrroles in good to excellent yields under mild conditions mediated by beta-cyclodextrin in water at room temperature. To the best of our knowledge, this is the first report on IBX, promoting complete aromatization leading to N-benzylpyrroles from the corresponding saturated five membered heterocyclic derivatives in water medium. (C) 2011 Elsevier Ltd. All rights reserved.
[EN] INSECTICIDAL PHTHALAMIDE DERIVATIVES<br/>[FR] DERIVES DE PHTALAMIDES INSECTICIDES
申请人:BAYER CROPSCIENCE AG
公开号:WO2004080984A1
公开(公告)日:2004-09-23
Novel insecticidal phthalamide derivatives of the formula (I), in which is a 5- or 6- membered heterocyclic group, a plurality of processes for preparing these compounds and their use for controlling pests.
Synthesis and nuclear magnetic resonance spectroscopic studies of 1-arylpyrroles
作者:Chang Kiu Lee、Jung Ho Jun、Ji Sook Yu
DOI:10.1002/jhet.5570370104
日期:2000.1
A series of m- and p-substituted 1-phenyl, 1-benzyl, 1-benzoyl, and 1-(2-phenylethyl)pyrroles was prepared and their 1H and 13C nmr spectroscopic characteristics were examined. In general, good correlations were observed between the chemical shift values of the βH and the βC of pyrroles [except 1-(2-phenylethyl)pyrroles] and the Hammettt σ. The observation may be explained in terms of the electronic
一系列的米-和p -取代的1-苯基,1-苄基,1-苯甲酰基,和1-(2-苯乙基)吡咯制备和它们的1 H和13 C NMR光谱特性进行了研究。一般情况下,被所述β的化学位移值之间观察到良好的相关性H和β吡咯C [除了1-(2-苯乙基)吡咯]和Hammetttσ。可以用取代基的电子效应来解释该观察结果,所述取代基通过吡咯环的βCs与m-和p之间的p轨道相互作用通过键和空间传输。苯环的Cs。还给出了苯环的1 H和13 C化学位移的1-吡咯基,1-吡咯基甲基和1-吡咯基取代基常数。
Decarboxylative formation of N-alkyl pyrroles from 4-hydroxyproline
作者:Indubhusan Deb、Daniel J. Coiro、Daniel Seidel
DOI:10.1039/c1cc11560j
日期:——
N-Alkyl pyrroles are obtained in a single step from 4-hydroxyproline and aldehydes in just 15 min under microwave irradiation.