888329-96-2Relevant academic research and scientific papers
Palladium-Catalyzed Silylcyanation of Ynamides: Regio- and Stereoselective Access to Tetrasubstituted 3-Silyl-2-Aminoacrylonitriles
Donnard, Morgan,Gandon, Vincent,Hansjacob, Pierre,Leroux, Frédéric R.
supporting information, (2022/02/09)
The palladium-catalyzed silylcyanation of ynamides is described. This reaction is fully regioselective, delivering tetrasubstituted 2-aminoacrylonitriles derivatives exclusively. Unexpectedly, the nature (aryl or alkyl) of the substituent located at the β-position of the ynamide directly controls the stereoselectivity. The reaction tolerates a number of functional groups and can be considered as the first general access to fully substituted 2-aminoacrylonitriles. Given the singular reactivity observed, a computational study was performed to shed light on the mechanism of this intriguing transformation. Relying on the specific reactivity of the newly installed vinylsilane functionality, the scope of 2-aminoacrylonitriles has been enlarged by postfunctionalization.
Fishing with copper acetylides: Selective alkynylation of heteronucleophiles
Guissart, Céline,Luhmer, Michel,Evano, Gwilherm
supporting information, p. 6727 - 6736 (2018/10/15)
Copper acetylides are readily available and especially convenient reagents for the alkynylation of a broad range of heteronucleophiles. Upon simple activation with molecular oxygen in the presence of suitable ligands and solvents, they readily transfer th
Hydrative Aminoxylation of Ynamides: One Reaction, Two Mechanisms
Pinto, Alexandre,Kaiser, Daniel,Maryasin, Boris,Di Mauro, Giovanni,González, Leticia,Maulide, Nuno
supporting information, p. 2515 - 2519 (2018/02/06)
Organic synthesis boasts a wide array of reactions involving either radical species or ionic intermediates. The combination of radical and polar species, however, has not been explored to a comparable extent. Herein we present the hydrative aminoxylation
Ynamide Preactivation Allows a Regio- and Stereoselective Synthesis of α,β-Disubstituted Enamides
Baldassari, Lucas L.,de la Torre, Aurélien,Li, Jing,Lüdtke, Diogo S.,Maulide, Nuno
supporting information, p. 15723 - 15727 (2017/12/02)
A novel ynamide preactivation strategy enables the use of otherwise incompatible reagents and allows preparation of α,β-disubstituted enamides with high regio- and stereoselectivity. Mechanistic analysis reveals the intermediacy of a triflate-bound intermediate as a solution-stable, effective keteniminium reservoir, whilst still allowing subsequent addition of organometallic reagents.
Enantioselective Construction of Acyclic Quaternary Carbon Stereocenters: Palladium-Catalyzed Decarboxylative Allylic Alkylation of Fully Substituted Amide Enolates
Starkov, Pavel,Moore, Jared T.,Duquette, Douglas C.,Stoltz, Brian M.,Marek, Ilan
supporting information, p. 9615 - 9620 (2017/07/24)
We report a divergent and modular protocol for the preparation of acyclic molecular frameworks containing newly created quaternary carbon stereocenters. Central to this approach is a sequence composed of a (1) regioselective and -retentive preparation of allyloxycarbonyl-trapped fully substituted stereodefined amide enolates and of a (2) enantioselective palladium-catalyzed decarboxylative allylic alkylation reaction using a novel bisphosphine ligand.
Efficient and recyclable Cu2(BDC)2(BPY)-catalyzed oxidative amidation of terminal alkynes: Role of bipyridine ligand
Le, Hanh T. N.,Tran, Thuan V.,Phan, Nam T. S.,Truong, Thanh
, p. 851 - 859 (2015/02/19)
We have described an efficient method for oxidative cross coupling reactions between activated N-H amines and terminal alkynes using heterogeneous Cu2(BDC)2(BPY) as recyclable catalyst (BDC = benzene-1,4-dicarboxylate; BPY = 4,4′-bipyridine). The optimal conditions involved the use of inexpensive NaHCO3 base and oxygen as terminal oxidant in toluene solvent at 80°C. Reactions proceeds efficiently, and high selectivity with only trace amount of diynes as well as good yields were achieved in a short reaction time. The Cu2(BDC)2(BPY) exhibited excellent catalytic activity and selectivity as compared to other Cu-MOFs on a broad reaction scope. Interestingly, the presence of bipyridine ligand was shown to enhance the catalyst stability. Thus, the Cu2(BDC)2(BPY) could be facilely separated from the reaction mixture by simple centrifugation and could be reused several times with only a slight decrease in catalytic activity.
Convenient and practical alkynylation of heteronucleophiles with copper acetylides
Theunissen, Cedric,Lecomte, Morgan,Jouvin, Kevin,Laouiti, Anouar,Guissart, Celine,Heimburger, Jeremy,Loire, Estelle,Evano, Gwilherm
, p. 1157 - 1166 (2014/05/20)
Copper acetylides, readily available reagents which are characterized by their lack of reactivity, can be simply activated by oxidation with oxygen in the presence of simple nitrogen ligands such as TMEDA or imidazole derivatives. Upon activation, these nucleophilic species undergo a formal umpolung and can transfer their alkyne subunit to a wide range of heteronucleophiles, including amides, oxazolidinones, imines, and dialkyl phosphites. This alkynylation, which provides one of the most practical entry to useful building blocks such as ynamides, ynimines, and alkynylphosphonates, proceeds under especially mild conditions and can be easily performed on a multigram scale. Georg Thieme Verlag Stuttgart, New York.
Heterogeneously catalyzed selective aerobic oxidative cross-coupling of terminal alkynes and amides with simple copper(ii) hydroxide
Jin, Xiongjie,Yamaguchi, Kazuya,Mizuno, Noritaka
supporting information; experimental part, p. 4974 - 4976 (2012/06/01)
Simple copper(ii) hydroxide Cu(OH)2 could act as an efficient heterogeneous catalyst for selective oxidative cross-coupling of a broad range of terminal alkynes and amides using air as a sole oxidant, giving the corresponding ynamides in moderate to high yields (56-93% yields). The Royal Society of Chemistry 2012.
A green synthetic route to imides from terminal alkynes and amides by simple solid catalysts
Jin, Xiongjie,Yamaguchi, Kazuya,Mizuno, Noritaka
supporting information, p. 866 - 867 (2012/11/07)
An atom-efficient and green synthetic route to highly valuable imides (5492% yields) from terminal alkynes and amides has been developed. This new route is composed of two consecutive reactions, that is, (i) the reported Cu(OH)2-catalyzed cross-coupling o
Copper-catalyzed alkynylation of amides with potassium alkynyltrifluoroborates: A room-temperature, base-free synthesis of ynamides
Jouvin, Kevin,Couty, Francois,Evano, Gwilherm
supporting information; experimental part, p. 3272 - 3275 (2010/10/21)
(Figure Presented) An efficient copper-mediated method for the coupling of potassium alkynyltrifluoroborates with nitrogen nucleophiles is reported. This reaction provides the first base-free and room-temperature synthesis of ynamides and allows for an easy preparation of these useful building blocks.
