143676-07-7Relevant academic research and scientific papers
Chemoselective and repetitive intermolecular cross-acyloin condensation reactions between a variety of aromatic and aliphatic aldehydes using a robust N-heterocyclic carbene catalyst
Jin, Ming Yu,Kim, Sun Min,Mao, Hui,Ryu, Do Hyun,Song, Choong Eui,Yang, Jung Woon
supporting information, p. 1547 - 1550 (2014/03/21)
We found that chemoselectivity of the crossed acyloin product is controlled by the adjustment of the aromatic aldehyde/aliphatic aldehyde ratio. Moreover, we observed the persistent catalytic activity of the homogeneous NHC catalyst in a solution due to N
Formation of α-hydroxyketones via irregular Wittig reaction
Okada, Hideki,Mori, Tomonori,Saikawa, Yoko,Nakata, Masaya
supporting information; experimental part, p. 1276 - 1278 (2009/09/05)
Αddition reactions of (1-methoxyalkyl)triphenylphosphonium ylides, derived from the corresponding Wittig salts and n-BuLi, to aldehydes were investigated. It was revealed that the betaine LiX complexes, the primary adducts, were converted to α-hydroxyketones, prior to the formation of oxaphosphetanes, by addition of aqueous NH4Cl at low temperature.
Generation and tandem reactions of 1-alkenyl-1,1-heterobimetallics: Practical and versatile reagents for organic synthesis
Li, Hongmei,Carroll, Patrick J.,Walsh, Patrick J.
, p. 3521 - 3531 (2008/10/09)
A practical and straightforward method for generation of versatile 1-alkenyl-1,1-heterobimetallic intermediates and their application to construction of functionalized building blocks are disclosed. Beginning with readily available air-stable 1-alkynyl-1-boronate esters, hydroboration with dicyclohexylborane generates 1-alkenyl-1,1-diboro species. In situ transmetallation with dialkylzinc reagents furnishes 1-alkenyl-1,1- heterobimetallic intermediates. Direct treatment with aldehydes followed by workup allows isolation of B(pin)-substituted allylic alcohols in 70-95% yield. The B(pin)-substituted allylic alcohols react with NBS to afford (E)-α,β-unsaturated aldehydes in 51-77% yield via a semipinacol-type rearrangement. In situ treatment of 1-alkenyl-1,1-heterobimetallic intermediates with aldehydes followed by TBHP oxidation enables the preparation of α-hydroxy ketones. Under optimized conditions, addition of 1-alkenyl-1,1-heterobimetallic intermediates to a variety of protected α- and β-hydroxy aldehydes proceeds with good to excellent control over diastereoselectivity to furnish differentially protected dihydroxy ketones. The 1-alkenyl-1,1-heterobimetallic intermediates have also been employed in tandem aldehyde addition/Suzuki cross-coupling reactions to provide densely functionalized allylic alcohols in good to excellent yields.
Development of a bio-inspired acyl-anion equivalent macrocyclization and synthesis of a trans-resorcylide precursor
Mennen, Steven M.,Miller, Scott J.
, p. 5260 - 5269 (2008/02/07)
(Chemical Equation Presented) Studies on the macrocyclization of α,ω-dialdehydes have revealed a strong dependence on ring size with respect to the ultimate efficiency of the reaction. Strong catalyst dependence was observed, as thiazolium salts led to no detectable product formation, whereas electron-deficient triazolium salts served as precatalysts for the cyclization. Surprisingly, the N-pentafluorophenyl triazolium variant led to cyclization at room temperature within a short 90-min reaction time. These findings were applied to a range of substrates, including the synthesis of a key intermediate in a rapid synthesis of trans-resorcylide.
Interrupted oligomerization revisited: Simple and efficient one-pot multicomponent approach to versatile synthetic intermediates
Valiulin, Roman A.,Halliburton, Logan M.,Kutateladze, Andrei G.
, p. 4061 - 4063 (2008/02/11)
A novel multicomponent reaction allowing for a one-pot formation of three carbon-carbon bonds has been developed. It is based on in situ generation and anionic dimerization of methylenedithiane and produces a versatile synthetic equivalent of 4-hydroxy-1,3-alkanediones which, among other things, offers expeditious one-pot access to 3(2H)-furanones.
Convenient Synthesis of Functionalized Dialkyl Ketones and Alkanoylsilanes: 1-(Benzotriazol-1-yl)-1-phenoxyalkanes as Alkanoyl Anion Equivalents
Katritzky, Alan R.,Lang, Hengyuan,Wang, Zuoquan,Lie, Zhu
, p. 7551 - 7557 (2007/10/03)
(Benzotriazol-1-yl)-1-phenoxyalkanes 10, prepared by two-step transformations of the corresponding aldehydes, are readily deprotonated at the methine group by BuLi.Subsequent reactions with alkyl halides, aldehydes, ketones, and imines yield the corresponding substituted derivatives that undergo hydrolysis under acidic conditions to afford the expected functionalized ketones 13, 15, 17, 19, 21, 24 and 25.Two successive lithiations of (benzotriazolyl)phenoxymethane, each followed by reaction with a trialkylsilyl chloride, alkyl halide, aldehyde, or ketone, generate similar intermediates 27, 39, 31, 33, and 36.Subsequent hydrolyses of 27, 29, 31, 33, and 36 yield the functionalized ketones 28, 30, and 32 and the alkanoylsilanes 34 and 37 in good yields.
Preparation and reaction of 1,1-zinc, boron and 1,1-copper, boron alkenyl bimetallics
Waas,Sidduri,Knochel
, p. 3717 - 3720 (2007/10/02)
Pinacol α-iodoalkenylboronates 8, readily prepared by the hydroboration of 1-iodoalkynes, were converted to 1,1-bimetallics of boron and zinc or copper which react with a wide range of electrophiles affording polyfunctional boronic esters. After H2O2 oxidation (30% H2O2, sat. aq. NaOAc), polyfunctional ketones were produced in good to excellent yields.
