13389-99-6Relevant articles and documents
Mn(III)-promoted synthesis of functionalized γ-lactones in acetic and formic acids
Lamarque, Laurent,Meou, Alain,Brun, Pierre
, p. 8283 - 8284 (1998)
The yield of substituted γ-lactones obtained by Mn(III)-mediated addition of potassium monomethyl malonate on cinnamate esters can be optimized by performing the reaction either in acetic or in formic acid, depending on the substrate.
A Sequential Umpolung/Enzymatic Dynamic Kinetic Resolution Strategy for the Synthesis of γ-Lactones
Maskeri, Mark A.,Schrader, Malte L.,Scheidt, Karl A.
, p. 5794 - 5798 (2020/05/06)
Combining biological and small-molecule catalysts under a chemoenzymatic manifold presents a series of significant advantages to the synthetic community. We report herein the successful development of a two-step/single flask synthesis of γ-lactones through the merger of Umpolung catalysis with a ketoreductase-catalyzed dynamic kinetic resolution, reduction, and cyclization. This combined approach delivers highly enantio- and diastereoenriched heterocycles and demonstrates the feasibility of integrating NHC catalysis with enzymatic processes.
Formation of γ-lactones through CAN-mediated oxidative cleavage of hemiketals
Jacobine, Alexander M.,Lin, Weimin,Walls, Bethany,Zercher, Charles K.
supporting information; experimental part, p. 7409 - 7412 (2009/05/07)
(Chemical Equation Presented) The generation of substituted γ-lactones can be accomplished through application of a tandem chain extension-aldol reaction, followed by CAN-mediated oxidative cleavage of the aldol product. The oxidative cleavage requires the intermediacy of a hemiketal and the presence of an α-heteroatom. Formation of the γ-lactone through the oxidative cleavage is used to assign stereochemistry of the aldol reaction and as the final step in a short synthesis of members of the phaseolinic acid family of natural products.
Efficient MnIII-mediated synthesis of functionalized trans-3,4-disubstituted-γ-butyrolactones
Méou, Alain,Lamarque, Laurent,Brun, Pierre
, p. 5301 - 5304 (2007/10/03)
The MnIII-induced addition of malonic acid (instead of acetic acid) to cinnamic esters affords in one step functionalized trans-3,4-disubstituted-γ-butyrolactones in a greatly improved yield which can be further optimized by conducting the reaction in either acetic or formic acid, depending on the substrate.
Stereoselective synthesis of trans-β-methoxycarbonyl-γ-aryl-γ-butyrolactones
Chen, Yali,Ding, Weiyu,Cao, Weiguo,Lu, Cheng
, p. 1953 - 1960 (2007/10/03)
Stereoselective synthesis of trans-β-methoxycarbonyl-γ-aryl-γ-butyrolactones (5) by the reaction of methoxycarbonylmethyl triphenyl arsonium bromide (1) and 2,2-dimethyl-5-substituted-benzal-1,3-dioxa-4,6-dioxa-4,6-dione (2) is carried out in the presence
Trimethylsilyl Cyanide - A Reagent for Umpolung, XX. - On the Regioselectivity of the Addition of Carbonyl Compounds to α,β-Unsaturated Aldehydes after Umpolung
Huenig, Siegfried,Schaefer, Matthias
, p. 177 - 190 (2007/10/02)
By addition of tBuMe2SiCN to α,β-unsaturated aldehydes 5 the silylated cyanohydrins 6 are produced.Deprotonation of 6 provides allylic anions which can be attached to aldehydes and ketones in α-position (kinetic control) (-> 8) or γ-position (thermodynamic control) (-> 9).In contrast to the Me3Si group which has been applied so far the tBuMe2Si group is stable under the reaction conditions.Therefore, the ratio of α/γ adducts can be tuned from > 95:5 to 5:95 depending on the substitution pattern of 6, the aldehydes and ketones, the reaction time and temperature, and even by some additives.The γ adducts 9 are easily transformed into γ-butyrolactones 27 by acidic hydrolysis. Key Words: Umpolung / Regioselectivity / Substituent effects / Acylation, nucleophilic / Aldehydes, α,β-unsaturated / Trimethylsilyl cyanide
Manganese(III)-Mediated γ-Lactone Annulation
Fristad, William E.,Peterson, John R.
, p. 10 - 18 (2007/10/02)
The annulation of a γ-lactone ring onto an alkene by manganese(III) acetate oxidation of acetic acid was investigated.The regioselectivity of addition to unsymmetrically substituted alkenes is reported along with the stereoselectivity of addition to various acyclic and cyclic alkenes.Alkenes with ionization potentials above 8.2 eV were found to react in good yield.The role of acetic anhydride in these reactions was studied, and it was shown to be oxidized faster than acetic acid and also led to different products.The fate of oxidized acetic acid or anhydridein the absence of suitable acceptor molecule has also been quantitatively identified.The relationship of enolizability, or C-H acidity, of the carboxylic acid being oxidized was established quantitatively.