Surgical Cleavage of Unstrained C(
<i>sp</i>
<sup>3</sup>
)−C(
<i>sp</i>
<sup>3</sup>
) Bonds in General Alcohols for Heteroaryl C−H Alkylation and Acylation
作者:Yaxin Wang、Le Yang、Shuai Liu、Lixia Huang、Zhong‐Quan Liu
DOI:10.1002/adsc.201900975
日期:2019.10.8
We reported herein a predictable and surgicalcleavage of carbon‐carbon bond in alcohols. A wide range of 1°, 2° and 3° alcohols including sugars and steroids without ring strain or steric hindrance were all compatible with this system. Also it offered a green and practical strategy for generation of alkyl/acyl radicals using alcohols as the sources. Besides, the features of visible‐light‐initiation
Direct C–H α-Arylation of Enones with ArI(O<sub>2</sub>CR)<sub>2</sub> Reagents
作者:Felipe Cesar Sousa e Silva、Nguyen T. Van、Sarah E. Wengryniuk
DOI:10.1021/jacs.9b11282
日期:2020.1.8
mediated by hypervalent iodine reagents. The reaction proceeds via a reductive iodonium Claisen rearrangement of in situ β-pyridinium silyl enol ethers. The aryl groups are derived from ArI(O2CCF3)2 reagents, which are readily accessed from the parent iodoarenes. It is tolerant of a wide range of substitution patterns and the incorporated arenes maintain the valuable iodine functional handle. Mechanistic
An Alternative to the Classical α-Arylation: The Transfer of an Intact 2-Iodoaryl from ArI(O<sub>2</sub>CCF<sub>3</sub>)<sub>2</sub>
作者:Zhiyu Jia、Erik Gálvez、Rosa María Sebastián、Roser Pleixats、Ángel Álvarez-Larena、Eddy Martin、Adelina Vallribera、Alexandr Shafir
DOI:10.1002/anie.201405982
日期:2014.10.13
The α‐arylation of carbonyl compounds is generally accomplished under basic conditions, both under metal catalysis and via aryl transferfrom the diaryl λ3‐iodanes. Here, we describe an alternative metal‐free α‐arylation using ArI(O2CCF3)2 as the source of a 2‐iodoaryl group. The reaction is applicable to activated ketones, such as α‐cyanoketones, and works with substituted aryliodanes. This formal
A General and Convenient Preparation of [Bis(trifluoroacetoxy)iodo]perfluoroalkanes and [Bis(trifluoroacetoxy)iodo]arenes by Oxidation of Organic Iodides Using Oxone and Trifluoroacetic Acid
作者:Aleksandra A. Zagulyaeva、Mekhman S. Yusubov、Viktor V. Zhdankin
DOI:10.1021/jo902733f
日期:2010.3.19
[Bis(trifluoroacetoxy)iodo]perfluoroalkanes CnF2n+1I(OCOCF3)2 (n = 4, 6, 8, 10, 12) can be conveniently prepared by the oxidation of the corresponding perfluoroalkyl iodides with Oxone in trifluoroacetic acid at room temperature and subsequently converted to the stable [hydroxy(tosyloxy)iodo]perfluoroalkanes, CnF2n+1I(OH)OTs, by treatment with p-toluenesulfonic acid. This general and convenient procedure
[双(三氟乙酰氧基)碘]全氟烷烃C n F 2 n +1 I(OCOCF 3)2(n = 4、6、8、10、12 )可以方便地通过在三氟乙酸中用过氧化物氧化相应的全氟烷基碘化物来制备。然后在室温下用对甲苯磺酸处理,将其转化为稳定的[羟基(甲苯磺酰氧基)碘]全氟烷烃C n F 2 n +1 I(OH)OTs 。该通用且方便的方法已进一步扩展到各种[双(三氟乙酰氧基)碘]芳烃ArI(OCOCF 3)2的合成。
Direct and Convenient Synthesis of [Bis(trifluoroacetoxy)iodo]arenes from Iodoarenes
作者:Md. Delwar Hossain、Tsugio Kitamura
DOI:10.1246/bcsj.79.142
日期:2006.1
An easy, safe, and effective method for preparing [bis(trifluoroacetoxy)iodo]arenes, ArI(OCOCF3)2, in high yields from some iodoarenes are reported, using a K2S2O8/CF3COOH/CH2Cl2 system. This procedure avoids the use of high temperature and severe reaction conditions.