Acyclic stereoselection. 46. Stereochemistry of the Michael addition of N,N-disubstituted amide and thioamide enolates to .alpha.,.beta.-unsaturated ketones
Cooperative Electrocatalytic and Chemoselective Alcohol Oxidation by Shvo's Catalyst
作者:Jeroen Lybaert、Stanislav Trashin、Bert U. W. Maes、Karolien De Wael、Kourosch Abbaspour Tehrani
DOI:10.1002/adsc.201600783
日期:2017.3.20
A new electrocatalytic conversion of alcohols to ketones and aldehydes was developed based on an electrochemical study of Shvo's complex. The oxidation of secondary alcohols was efficiently performed under mild conditions using a catalytic amount of Shvo's catalyst, in combination with a sub‐stoichiometric amount of 2,6‐dimethoxy‐1,4‐benzoquinone in N,N‐dimethylformamide at 80 °C. The hydroquinone
Synthesis of <i>Z</i>-Alkenes from Rh(I)-Catalyzed Olefin Isomerization of β,γ-Unsaturated Ketones
作者:Lian-Gang Zhuo、Zhong-Ke Yao、Zhi-Xiang Yu
DOI:10.1021/ol401607c
日期:2013.9.20
Developing olefin isomerization reactions to reach kinetically controlled Z-alkenes is challenging because formation of trans-alkenes is thermodynamically favored under the traditional catalytic conditions using acids, bases, or transition metals as the catalysts. A new synthesis of Z-alkenes from Rh(I)-catalyzed olefin isomerization of β,γ-unsaturated ketones to α,β-unsaturated ketones was developed
?-Cleavage of Bis(homoallylic) Potassium Alkoxides. Two-Step Preparation of Propenyl Ketones from Carboxylic Esters. Synthesis ofar-Turmerone, ?-Damascone, ?-Damascone, and ?-Damascenone
作者:Roger L. Snowden、Simon M. Linder、Bernard L. Muller、Karl H. Schulte-Elte
DOI:10.1002/hlca.19870700721
日期:1987.11.4
The transformation of 36 bis(homoallylic) alcohols VII to alkenones IX and Xvia β-cleavage of their potassiumalkoxides VIIa in HMPA has been investigated (cf. Scheme 2). These studies have established an order of β-cleavage for 2-propenyl, 1-methyl-2propenyl, 2-methyl-2-propenyl, 1,1-dimethyl-2propenyl, and benzyl groups in alkoxides 49a–56a and have allowed a comparison between the β-cleavege reaction
Iron-Catalyzed Aerobic Oxidation of Allylic Alcohols: The Issue of C═C Bond Isomerization
作者:Jinxian Liu、Shengming Ma
DOI:10.1021/ol402434x
日期:2013.10.18
An aerobic oxidation of allylic alcohols using Fe(NO3)3·9H2O/TEMPO/NaCl as catalysts under atmospheric pressure of oxygen at room temperature was developed. This eco-friendly and mild protocol provides a convenient pathway to the synthesis of stereodefined α,β-unsaturated enals or enones with the retention of the C–C double-bond configuration.
研究了Fe(NO 3)3 ·9H 2 O / TEMPO / NaCl在室温大气压下氧对烯丙醇的好氧氧化反应。这种环保且温和的方案为保留立体碳双键构型的立体定义的α,β-不饱和烯酮或烯酮的合成提供了便利的途径。
<i>α</i>-Oxygen-atom Induced Methylenation of Ketones by CH<sub>2</sub>(ZnI)<sub>2</sub>
Ketones bearing a hetero-atom at α-position were methylenated selectively by CH2(ZnI)2 to give allylic alcohols; a nucleophilic attack of the zinc species was accelerated with a coordination of a hetero-atom at α-position.