7661-44-1Relevant academic research and scientific papers
Direct Synthesis of Mono-α-arylated Ketones from Alcohols and Olefins via Ni-Catalyzed Oxidative Cross-Coupling
Yang, Peng-Fei,Shu, Wei
supporting information, p. 6203 - 6208 (2020/08/12)
Controlled synthesis of α-monoarylated ketones is significant yet challenging due to the site-selectivity issues and nonproductive overarylation reactions. Herein, we reported the direct synthesis of α-arylated ketones enabled by Ni-catalyzed dehydrogenative cross-coupling reaction cascade between alcohols and olefins. The use of readily available and cost-effective alcohols and olefins provides a straightforward access to monoarylated ketones in good yields with exclusive selectivity without using any advanced synthetic intermediates.
Regioselective 1,2-Diol Rearrangement by Controlling the Loading of BF3·Et2O and Its Application to the Synthesis of Related Nor-Sesquiterene- and Sesquiterene-Type Marine Natural Products
Wang, Jun-Li,Li, Hui-Jing,Wang, Hong-Shuang,Wu, Yan-Chao
, p. 3811 - 3814 (2017/07/26)
The regiocontrolled rearrangement of 1,2-diols has been achieved by controlling the loading of BF3·Et2O. Its applicability is showcased by the divergent synthesis of austrodoral, austrodoric acid, and 8-epi-11-nordriman-9-one, as well as a formal synthesis of siphonodictyal B and liphagal. A new light is shed on piancol-type rearrangements that will be useful in diversity-oriented synthesis of related natural products.
Complementary catalytic strategies to access α-chiral aldehydes
Mazet, Clement
, p. 658 - 662 (2013/11/06)
The present article summarizes the development of two novel and complementary catalytic methods to access α-chiral aldehydes. A C1-symmetric chiral (P,N) ligand with a structure derived from the ubiquitous binepine scaffold has been specifically designed for the Pd-catalyzed α arylation of aldehydes to access indane derivatives with a well-defined quaternary stereocenter in high yields and excellent enantioselectivities. In addition, a dinuclear palladium hydride catalyst has been synthesized for the isomerization of terminal and trisubstituted epoxides into aldehydes and ketones respectively. Combined experimental and theoretical investigations pointed to an unprecedented 'epoxide-opening/hydride-transfer' sequence. The mechanism also features two distinct enantio-determining steps in the kinetic resolution of racemic epoxides. Schweizerische Chemische Gesellschaft.
Isomerization of terminal epoxides by a [Pd-H] catalyst: A combined experimental and theoretical mechanistic study
Vyas, Devendra J.,Larionov, Evgeny,Besnard, Celine,Guenee, Laure,Mazet, Clement
, p. 6177 - 6183 (2013/06/04)
An unusual palladium hydride complex has been shown to be a competent catalyst in the isomerization of a variety of terminal and internal epoxides. The reaction displayed broad scope and synthetic utility. Experimental and theoretical evidence are provided for an unprecedented hydride mechanism characterized by two distinct enantio-determining steps. These results hold promise for the development of an enantioselective variant of the reaction.
Biocatalysed concurrent production of enantioenriched compounds through parallel interconnected kinetic asymmetric transformations
Rioz-Martinez, Ana,Bisogno, Fabricio R.,Rodriguez, Cristina,De Gonzalo, Gonzalo,Lavandera, Ivan,Torres Pazmino, Daniel E.,Fraaije, Marco W.,Gotor, Vicente
supporting information; body text, p. 1431 - 1437 (2010/06/18)
Parallel interconnected kinetic asymmetric transformations were performed in order to obtain enantioenriched derivatives starting from a set of racemic or prochiral compounds. Thus, in a one-pot reaction using two redox biocatalysts (a BVMO and an ADH) and a catalytic amount of cofactor that acts as a mediator, enantioenriched ketones, sulfoxides, and sec-alcohols were concurrently obtained in a strict parallel way, minimising the quantity of reagents employed. By selecting the appropriate biocatalysts, this methodology represents a potential tool for performing stereodivergent transformations.
One-carbon homologation of unsymmetrical ketones through magnesium β-oxido carbenoid rearrangement and trapping the enolate intermediates with electrophiles
Tanaka, Shu,Anai, Takehiro,Tadokoro, Makoto,Satoh, Tsuyoshi
, p. 7199 - 7210 (2008/12/20)
A procedure for one-carbon homologation of unsymmetrical ketones, including one-carbon ring-expansion of 2-substituted cyclohexanones, through magnesium β-oxido carbenoid rearrangement as the key reaction is described. Addition of the α-sulfinyl carbanion of 1-chloroethyl p-tolyl sulfoxide to an unsymmetrical ketone gave two diastereomers as adducts in good yields. The adducts were treated with a base to give alkoxides, which were treated with a Grignard reagent to give magnesium β-oxido carbenoids. The β-oxido carbenoid rearrangement then took place to afford one-carbon homologated ketones having a methyl group at the α-position. Remarkable specificity or selectivity was observed in the rearrangement. The magnesium enolate intermediates of this reaction were found to be able to get trapped with several electrophiles to give one-carbon homologated α,α-disubstituted ketones. Origin of the specificity and selectivity is also discussed.
Titanocene(II)-promoted desulfurizative acylation of thioacetals with alkanenitriles
Takeda, Takeshi,Taguchi, Haruhiko,Fujiwara, Tooru
, p. 65 - 68 (2007/10/03)
Ketones were obtained in good yields by titanocene(II)-promoted reaction of thioacetals with alkanenitriles. The regioselective formation of α-substituted ketone was observed when the reaction was carried out in the presence of methyl iodide or benzyl bro
The Chemistry of 5-Oxodihydroisoxazoles. XII. Trapping of Derived Ketenimines with Lithium Amides and Alkyllithiums
Ang, Kiah H.,Prager, Rolf H.,Williams, Craig M.
, p. 55 - 64 (2007/10/02)
Isoxazolones unsubstituted at C 3 react with lithium amides or alkyllithiums to give ketenimines.The presence of an ethoxycarbonyl group at C 4 allows capture of this species by addition of a second equivalent of the lithiated species to give enolates which can be alkylated in situ.The presence of a phenyl group at C 4 gives a ketenimine which reacts intramolecularly in the presence of lithium amides, whereas alkyllithiums undergo addition in synthetically useful processes.
The Chemistry of 5-Oxodihydroisoxazoles. X. Butyllithium and Lithium Diisopropylamide Promoted Rearrangements of 3-Unsubstituted Isoxazol-5(2H)-ones
Prager, Rolf H.,Razzino, Pasquale
, p. 1673 - 1684 (2007/10/02)
The reaction pathway of 3-unsubstituted isoxazol-5(2H)-ones with bases, proposed by Woodman to proceed via four intermediates to azetidine-2,4-diones, has been confirmed by the isolation of products unequivocally derived from each of the intermediates.Iso
Stereoselective Oxidation of β-Methyl-sec-alcohols and α-Methylketones by Corynebacterium equi IFO 3730
Ohta,Hiromichi,Iwabuchi, Tetsuya,Tsuchihashi, Gen-ichi
, p. 725 - 732 (2007/10/02)
The enzyme system of Corynebacterium equi IFO 3730 catalyzed the diastereo-selective oxidation of β-methyl-sec-alcohols.For example, only the erythro isomer of 5-methyl-6-tetradecanol was oxidized to the corresponding ketone, the threo-alcohol remaining.M
