22414-64-8Relevant academic research and scientific papers
Mechanism and the origins of stereospecificity in copper-catalyzed ring expansion of vinyl oxiranes: A traceless dual transition-metal-mediated process
Mustard, Thomas J. L.,MacK, Daniel J.,Njardarson, Jon T.,Cheong, Paul Ha-Yeon
, p. 1471 - 1475 (2013)
Density functional theory computations of the Cu-catalyzed ring expansion of vinyloxiranes is mediated by a traceless dual Cu(I)-catalyst mechanism. Overall, the reaction involves a monomeric Cu(I)-catalyst, but a single key step, the Cu migration, requires two Cu(I)-catalysts for the transformation. This dual-Cu step is found to be a true double Cu(I) transition state rather than a single Cu(I) transition state in the presence of an adventitious, spectator Cu(I). Both Cu(I) catalysts are involved in the bond forming and breaking process. The single Cu(I) transition state is not a stationary point on the potential energy surface. Interestingly, the reductive elimination is rate-determining for the major diastereomeric product, while the Cu(I) migration step is rate-determining for the minor. Thus, while the reaction requires dual Cu(I) activation to proceed, kinetically, the presence of the dual-Cu(I) step is untraceable. The diastereospecificity of this reaction is controlled by the Cu migration step. Suprafacial migration is favored over antarafacial migration due to the distorted Cu π-allyl in the latter.
The synthesis of the insect pheromone (2S,3R,7R)-3,7-dimethyltridec-2-yl acetate from racemic 3,4-dimethyl-γ-butyrolactone by diastereoselective chiral resolution
Prokhorevich, Konstantin N.,Kulinkovich, Oleg G.
, p. 2976 - 2980 (2006)
The insect pheromone (2S,3R,7R)-3,7-dimethyltridec-2-yl acetate 1-Ac was prepared from diastereomerically enriched (2S*,3R*,7R)-1, which in turn was obtained by the coupling of racemic 3,4-dimethyl-γ-butyrolactone with (7S)-2-methyloctyllithium, followed by a Wolff-Kishner reduction of the resulting ketone. Conversion of (2S*,3R*,7R)-1 to the corresponding alkyl hydrogen phthalate and diastereomer salt formation with (S)-PhCHMeNH2 provided after several crystallizations individual diastereomer, which was later transformed into target 1-Ac after hydrolysis and acylation.
Synthesis of Seven-Membered Cross-Conjugated Cyclic Trienes by 8πElectrocyclic Reaction
Kato, Ranmaru,Saito, Hiroki,Uda, Shoko,Domon, Daisuke,Ikeuchi, Kazutada,Suzuki, Takahiro,Tanino, Keiji
supporting information, p. 8878 - 8882 (2021/11/17)
A method for the synthesis of 3-methylene-1,4-cycloheptadiene derivatives via an 8πelectrocyclization reaction was developed. The triene substrate bearing a phosphate or carbamate group was prepared from γ,δ-unsaturated esters and α,β-unsaturated aldehydes in four steps. Upon treatment with NaHMDS or KHMDS, the substrate formed a heptatrienyl anion, which underwent electrocyclization and subsequent β-elimination of the leaving group. The product could be converted into a tropylium salt in two steps.
Diversely Substituted Quinolines via Rhodium-Catalyzed Alkyne Hydroacylation
Neuhaus, James D.,Morrow, Sarah M.,Brunavs, Michael,Willis, Michael C.
supporting information, p. 1562 - 1565 (2016/05/02)
The Rh-catalyzed hydroacylative union of aldehydes and o-alkynyl anilines leads to 2-aminophenyl enones, and onward to substituted quinolines. The mild reaction conditions employed in this chemistry result in a process that displays broad functional group
Structure-activity relationship study of a series of novel oxazolidinone derivatives as IL-6 signaling blockers
Singh, Sarbjit,Gajulapati, Veeraswamy,Gajulapati, Kondaji,Goo, Ja-Il,Park, Yeon-Hwa,Jung, Hwa Young,Lee, Sung Yoon,Choi, Jung Ho,Kim, Young Kook,Lee, Kyeong,Heo, Tae-Hwe,Choi, Yongseok
supporting information, p. 1282 - 1286 (2016/02/23)
A series of oxazolidinone and indole derivatives were synthesized and evaluated as IL-6 signaling blockers by measuring the effects of these compounds on IL-6-induced luciferase expression in human hepatocarcinoma HepG2 cells transfected with p-STAT3-Luc. Among different compounds screened, compound 4d was emerged as the most potent IL-6 signaling blockers with IC50 value of 5.9 μM which was much better than (+)-Madindoline A (IC50 = 21 μM), a known inhibitor of IL-6.
Hydroxyl-directed stereoselective diboration of alkenes
Blaisdell, Thomas P.,Caya, Thomas C.,Zhang, Liang,Sanz-Marco, Amparo,Morken, James P.
supporting information, p. 9264 - 9267 (2014/07/21)
An alkoxide-catalyzed directed diboration of alkenyl alcohols is described. This reaction occurs in a stereoselective fashion and is demonstrated with cyclic and acyclic homoallylic and bishomoallylic alcohol substrates. After oxidation, the reaction generates 1,2-diols such that the process represents a method for the stereoselective directed dihydroxylation of alkenes.
Selective palladium-catalyzed hydroformylation of alkynes to α,β-Unsaturated Aldehydes
Fang, Xianjie,Zhang, Min,Jackstell, Ralf,Beller, Matthias
, p. 4645 - 4649 (2013/05/22)
Atom-efficient: A selective palladium catalyst system is used for the hydroformylation of alkynes (see picture). In this syngas reaction, various alkynes were smoothly transformed to synthetically interesting α,β-unsaturated aldehydes in good yields with high regio- and stereoselectivity. Copyright
Construction of 1,5-enynes by stereospecific Pd-catalyzed allyl-propargyl cross-couplings
Ardolino, Michael J.,Morken, James P.
experimental part, p. 8770 - 8773 (2012/07/02)
The palladium-catalyzed cross-coupling of chiral propargyl acetates and allyl boronates delivers chiral 1,5-enynes with excellent levels of chirality transfer and can be applied across a broad range of substrates.
Pd-catalyzed enantioselective allyl-allyl cross-coupling
Zhang, Ping,Brozek, Laura A.,Morken, James P.
supporting information; scheme or table, p. 10686 - 10688 (2010/11/04)
The Pd-catalyzed cross-coupling of allylic carbonates and allylB(pin) is described. The regioselectivity of this reaction is sensitive to the bite angle of the ligand, with small-bite-angle ligands favoring the branched substitution product. This mode of
Palladium-Catalyzed isomerization of exo-methylenic allylic alcohols
Fordred, Paul S.,Niyadurupola, D.Gangani,Wisedale, Richard,Bull, Stevend
experimental part, p. 2310 - 2314 (2009/12/27)
Treatment of allylic alcohols containing a 1,1-disubstituted alkene with a palladium catalyst and hydrogen gas (1 bar) results in facile isomerization to their corresponding trisubstituted (E)-allylic alcohols, along with small amounts of the corresponding hydrogenated products.
