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.
在微波辐射下,仅用15分钟即可从4-羟基脯氨酸和醛一步获得N-烷基吡咯。
Visible light dye-photosensitised oxidation of pyrroles using a simple LED photoreactor
作者:James K. Howard、Kieran J. Rihak、Christopher J. T. Hyland、Alex C. Bissember、Jason A. Smith
DOI:10.1039/c6ob01719c
日期:——
The photooxidation of pyrrole is typically low yielding due to the absorbance of ultraviolet light, which leads to uncontrolled polymerisation and decomposition. Presented herein is the development of a simple and cost-effective photoreactor utilising Light Emitting Diodes (LEDs) as the light source, and its application to the dye-sensitised oxidation of a range of pyrroles to give corresponding 3-pyrrolin-2-ones
吡咯的光氧化通常由于紫外线的吸收而产率低,这导致不受控制的聚合和分解。本文提出了利用发光二极管(LED)作为光源的简单且成本有效的光反应器的开发,并将其应用于一系列吡咯的染料敏化氧化以产生相应的3-吡咯啉-2-酮。还探讨了该方法在1 O 2生成中的广泛应用。
Sustainable Pathways to Pyrroles through Iron-Catalyzed<i>N</i>-Heterocyclization from Unsaturated Diols and Primary Amines
作者:Tao Yan、Katalin Barta
DOI:10.1002/cssc.201600607
日期:2016.9.8
pharmaceutically activecompounds and play an important role in medicinal chemistry. Therefore, the development of new, atom‐economic, and sustainable catalytic strategies to obtain these moieties is highly desired. Direct catalytic pathways that utilize readily available alcohol substrates have been recently established; however, these approaches rely on the use of noble metals such as ruthenium or iridium
An orally administrable antibacterial agent which contains as an active ingredient a carbapenem compound represented by the formula [1] below,
wherein R
0
represents hydrogen atom or the like; R
1
represents C
1
-C
3
alkyl substituted by hydroxyl group or the like; R represents hydrogen atom or a group which regenerates a carboxyl group by hydrolysis in a living body; L represents a single bond, methylene, —OCH
2
(CO)— or the like; and Het represents a group represented by the following formula [2],
wherein m and n independently represent 0 or 1; A and B independently represent methylene, carbonyl or the like; Y represents methylene, ethylene, oxygen atom, —OCH
2
—, —NR
a
CH
2
— (wherein R
a
represents hydrogen atom, optionally substituted C
1
-C
4
alkyl group or the like) or the like.