62108-07-0Relevant academic research and scientific papers
METHODS OF MAKING DELMOPINOL AND SALTS THEREOF
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Paragraph 0048; 0054; 0066; 0074-0077; 0090, (2021/08/06)
Disclosed are methods of making delmopinol and delmopinol salts (e.g., delmopinol metal salts, such as, for example, delmopinol calcium salts, delmopinol sodium salts, delmopinol potassium salts, and/or delmopinol magnesium salts). Delmopinol has structure (I) and a salt of delmopinol has structure (II).
Organocatalytic Trapping of Elusive Carbon Dioxide Based Heterocycles by a Kinetically Controlled Cascade Process
Bo, Carles,Kleij, Arjan W.,Limburg, Bart,Qiao, Chang,Sprachmann, Josefine,Villar-Yanez, Alba
supporting information, p. 18446 - 18451 (2020/08/21)
A conceptually novel approach is described for the synthesis of six-membered cyclic carbonates derived from carbon dioxide. The approach utilizes homoallylic precursors that are converted into five-membered cyclic carbonates having a β-positioned alcohol group in one of the ring substituents. The activation of the pendent alcohol group through an N-heterocyclic base allows equilibration towards a thermodynamically disfavored six-membered carbonate analogue that can be trapped by an acylating agent. Various control experiments and computational analysis of this manifold are in line with a process that is primarily dictated by a kinetically controlled acylation step. This cascade process delivers an ample diversity of six-membered cyclic carbonates in excellent yields and chemoselectivities under mild reaction conditions.
General, Auxiliary-Enabled Photoinduced Pd-Catalyzed Remote Desaturation of Aliphatic Alcohols
Parasram, Marvin,Chuentragool, Padon,Wang, Yang,Shi, Yi,Gevorgyan, Vladimir
supporting information, p. 14857 - 14860 (2017/10/31)
A general, efficient, and site-selective visible light-induced Pd-catalyzed remote desaturation of aliphatic alcohols into valuable allylic, homoallylic, and bis-homoallylic alcohols has been developed. This transformation operates via a hybrid Pd-radical mechanism, which synergistically combines the favorable features of radical approaches, such as a facile remote C-H HAT step, with that of transition-metal-catalyzed chemistry (selective β-hydrogen elimination step). This allows achieving superior degrees of regioselectivity and yields in the desaturation of alcohols compared to those obtained by the state-of-the-art desaturation methods. The HAT at unactivated C(sp3)-H sites is enabled by the easily installable/removable Si-auxiliaries. Formation of the key hybrid alkyl Pd-radical intermediates is efficiently induced by visible light from alkyl iodides and Pd(0) complexes. Notably, this method requires no exogenous photosensitizers or external oxidants.
Synthesis of alkyl-substituted six-membered lactones through ring-closing metathesis of homoallyl acrylates. An easy route to pyran-2-ones, constituents of tobacco flavor
D'Annibale, Andrea,Ciaralli, Laura,Bassetti, Mauro,Pasquini, Chiara
, p. 6067 - 6074 (2008/02/10)
(Chemical Equation Presented) The ring-closing metathesis (RCM) reactions of homoallylic acrylates bearing alkyl substituents on various positions of their skeleton afford the corresponding pentenolides in the presence of carbene ruthenium catalysts. For R3 = R4 = H, or R3 = Me, R4 = H, the reactions are catalyzed by complex [RuCl 2(PCy3)2(=CHPh)], while a second-generation Grubbs catalyst is required when R3 = H and R4 = Me, R3 = R4 = Me, or R3 = i-Pr and R4 = H. Alkyl substitution at the homoallylic carbon (R1, R2) increases the yield of the reaction when both the acrylic and/or homoallylic double bonds are methyl-substituted. The interaction of the catalyst with the substrate in the initiation stage involves the homoallylic double bond rather than the acrylic moiety, and the resulting alkylidene species from the first-generation Grubbs catalyst can be observed by 1H and 31P NMR. The racemic tobacco constituents 4-isopropyl-5,6- dihydropyran-2-one and 4-isopropyltetrahydropyran-2-one are prepared via a short reaction sequence, involving the RCM reaction as the key transformation.
Direct transformation of allylic and benzylic thiols, thioethers, and disulfides into organolithium compounds
Yus, Miguel,Martinez, Pedro,Guijarro, David
, p. 2365 - 2376 (2007/10/03)
The reaction of allylic and benzylic thiols 1, disulfides 3, and thioethers 4 and 5 with an excess of lithium and a catalytic amount of 4,4′-di-tert-butylbiphenyl (DTBB, 5mol%) afforded the corresponding allylic and benzylic organolithium reagents via reductive cleavage of the carbon-sulfur bond. The generated organolithium compounds gave the expected products 2 by reaction with several electrophiles followed by hydrolysis with water. The reaction conditions and the lithiation procedure (stepwise of Barbier-type process) depended on the starting sulfur containing compound.
Substituted isoxazolidines and isoxazolines as intermediates for delimopinal
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, (2008/06/13)
The invention concerns intermediates having the formula STR1 wherein R is 2-propylpentyl optionally with one, two or three internal unsaturated bonds, or 2-substituted-2-propylpentyl optionally with one or two internal unsaturated bonds wherein the 2-substituent is a leaving group.
ACTIVATION DU ZINC PAR LE TRIMETHYLCHLOROSILANE: PREPARATION D'ALCOOLS β-ETHYLENIQUES A PARTIR DE BROMURES α-ETHYLENIQUES, DE DERIVES CARBONYLES ET DE ZINC DANS L'ETHER.
Picotin, G.,Miginiac, Ph.
, p. 4551 - 4552 (2007/10/02)
β-ethylenic alcohols can be prepared in ether from an α-ethylenic bromide, a carbonyl compound and zinc, provided the metal is previously activated by addition of a small amount of trimethylchlorosilane.
γ-Substituted Secondary Organoalkaline Compounds and their Chlorinated Precursors: Synthetic Applications
Barluenga, Jose,Florez, Josefa,Yus, Miguel
, p. 846 - 849 (2007/10/02)
The preparation of γ-functionalised secondary organoalkaline metal compounds starting from methyl 3-chlorobutanoate (obtained by addition of hydrogen chloride to commercially available methyl trans-2-butenoate) is described.Reactions of these metallated compounds with suitable electrophilic reagents leads to a variety of tertiary alcohol derivatives.
Chemoselective Addition of Organotitanium Reagents to Carbonyl Compounds
Reetz, Manfred T.,Westermann, Juergen,Steinbach, Rainer,Wenderoth, Bernd,Peter, Roland,et al.
, p. 1421 - 1440 (2007/10/02)
The conversion of classical carbanions such as RMgX, RLi, or deprotonated nitriles, sulfones, and carboxylic esters into titanium analogs results in reagents which add chemoselectively to carbonyl compounds in the presence of other functional groups.The standard titanating agent is chlorotriisopropoxytitanium (1).Grignard-type reactions and aldol additions are aldehyde-selective in the presence of ketones.Other functional groups such as alkyl and aryl halides, esters, amides as well as nitro and cyano moieties are tolerated.Discrimination between two aldehydes or two ketones is also possible.Replacing alkoxy ligands by methyl groups at titanium increases reactivity dramatically, relative rates increasing in the series CH3Ti(OCHMe2)3 (CH3)2Ti(OCHMe2)2 (CH3)4Ti.The latter reagent and its zirconium analog methylate sterically hindered and/or enolizable ketones which normally fail to undergo Grignard reactions.The ate complex H2C=CHCH2Ti(OCHMe2)4MgCl (63) is aldehyde-selective, while the amino analog H2C=CHCH2Ti(NMe2)4MgCl (64) adds selectively to ketones in the presence of aldehydes.
Chemoselective in situ Protection of Aldehydes and Ketones using Titanium Tetrakis(dialkylamides)
Reetz, Manfred T.,Wenderoth, Bernd,Peter, Roland
, p. 406 - 408 (2007/10/02)
Titanium tetrakis(dialkylamides) are chemoselective protective agents for carbonyl compounds, so that such reactions as Grignard and aldol additions can be induced to occur at ketone groups in the presence of aldyhydes in a one-pot precedure.
