68972-96-3Relevant academic research and scientific papers
Copper(0) nanoparticle catalyzed Z-Selective Transfer Semihydrogenation of Internal Alkynes
Moran, Maria Jesus,Martina, Katia,Bieliunas, Vidmantas,Baricco, Francesca,Tagliapietra, Silvia,Berlier, Gloria,De Borggraeve, Wim M.,Cravotto, Giancarlo
supporting information, p. 2850 - 2860 (2021/05/06)
The use of copper(0) nanoparticles in the transfer semihydrogenation of alkynes has been investigated as a lead-free alternative to Lindlar catalysts. A stereo-selective methodology for the hydrogenation of internal alkynes to the corresponding (Z)-alkenes in high isolated yields (86% average) has been developed. This green and sustainable transfer hydrogenation protocol relies on non-noble copper nanoparticles for reduction of both electron-rich and electron-deficient, aliphatic-substituted and aromatic- substituted internal alkynes. Polyols, such as ethylene glycol and glycerol, have been proven to act as hydrogen sources, and excellent stereo- and chemoselectivity have been observed. Enabling technologies, such as microwave and ultrasound irradiation are shown to enhance heat and mass transfer, whether used alone or in combination, resulting in a decrease in reaction time from hours to minutes. (Figure presented.).
Chemoenzymatic route to stereodefined 2-(azidophenyl)oxazolines for click chemistry
Monsen, Paige J.,Luzzio, Frederick A.
supporting information, (2020/12/29)
Aryl-substituted esters of a racemic diprotected 2-azido-1-alkanol were submitted to the Staudinger/aza-Wittig reaction in order to assess scope and establish conditions for their cyclization to the corresponding 2,4,5-trisubstituted oxazolines. Following
Copper-Catalyzed Oxyalkynylation of C-S Bonds in Thiiranes and Thiethanes with Hypervalent Iodine Reagents
Borrel, Julien,Pisella, Guillaume,Waser, Jerome
supporting information, p. 422 - 427 (2020/01/31)
We report the oxyalkynylation of thiiranes and thietanes using ethynylbenziodoxolone reagents (EBXs) to readily access functionalized building blocks bearing an alkynyl, a benzoate, and an iodide group. The reaction proceeds with high atom efficiency most
SPIRO-LACTAM NMDA RECEPTOR MODULATORS AND USES THEREOF
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Page/Page column 38; 69; 74-75, (2019/08/26)
Disclosed are compounds having potency in the modulation of NMDA receptor activity. Such compounds can be used in the treatment of conditions such as depression and related disorders as well as other disorders.
Fe2O3-Promoted Intermolecular Chlorotrifluoromethylthiolation of Alkenes
Jia, Yimin,Qin, Hongmei,Wang, Na,Jiang, Zhong-Xing,Yang, Zhigang
, p. 2808 - 2817 (2018/03/09)
A simple, convenient method for intermolecular chlorotrifluoromethylthiolation of alkenes by using a low-cost and more abundant iron catalyst has been developed. This protocol provides a straightforward way to synthesize a variety of useful SCF3/sub
Correction to: Nickel-catalyzed asymmetric reductive cross-coupling to access 1,1-diarylalkanes (Journal of the American Chemical Society (2017) 139 (5684-5687) DOI: 10.1021/jacs.7b01705)
Poremba, Kelsey E.,Kadunce, Nathaniel T.,Suzuki, Naoyuki,Cherney, Alan H.,Reisman, Sarah E.
supporting information, p. 7746 - 7746 (2018/06/26)
Pages 5684 and 5685, Table of Contents, and Supporting Information. The stereochemistry of L1, depicted as the (S,S)- enantiomer in Figure 1, Table 1, the TOC graphic (identical to Figure 1), and the Supporting Information of the original publication, was incorrect. (R,R)-L1 was used in this study. The stereochemistry of (R,R)-L1 has been confirmed by singlecrystal X-ray diffraction; the X-ray diffraction data and CIF file for (R,R)-L1 have been added to the Supporting Information. The corrected TOC graphic/Figure 1 is shown here. (R,R)-L4 and (R,R)-L5 were also used in Table 1 and incorrectly depicted as (S,S)-L4 and (S,S)-L5 in the original publication. To reflect that different enantiomeric series of catalysts were used, Table 1 has been updated to indicate that entries 2, 3, and 6 produce (S)-3a. This correction does not change the stereochemical assignment of the diarylalkane products, or the conclusions of the Communication. The stereochemistry of the products was assigned by obtaining an X-ray structure of diarylalkane 3k, and the rest of the compounds were assigned by analogy. (Table Presented).
Solid supported Hayashi–J?rgensen catalyst as an efficient and recyclable organocatalyst for asymmetric Michael addition reactions
Szcze?niak, Piotr,Staszewska-Krajewska, Olga,Furman, Bart?omiej,Mlynarski, Jacek
supporting information, p. 1765 - 1773 (2017/12/04)
A comparison of three different catalytic systems for the efficient, asymmetric synthesis of N-({(3R,4R)-4-[(benzyloxy)methyl]pyrrolidin-3-yl}methyl)-N-(2-methylpropyl)benzenesulfonamide 1 (BZN) is described. The presented strategy is based on the organocatalytic Michael addition of aldehyde 2 to trans-nitroalkene 3, and subsequent reductive cyclization. High yields, enantio-, and diastereoselectivities were achieved in the Michael addition by application of a POSS- or Wang resin-supported Hayashi–J?rgensen catalyst.
Total Synthesis of Ovafolinins A and B: Unique Polycyclic Benzoxepin Lignans through a Cascade Cyclization
Davidson, Samuel J.,Barker, David
supporting information, p. 9483 - 9486 (2017/08/01)
Ovafolinins A and B, isolated from Lyonia ovalifolia var. elliptica, are lignans that contain a unique bridged structure containing a penta- and tetracyclic benzoxepin and an aryl tetralin. We report the first total synthesis of these natural products in which an acyl-Claisen rearrangement was initially utilized to construct the lignan backbone with correct relative stereochemistry. Judicious use of a bulky protecting group placed reactive moieties in the correct orientation, thereby resulting in a cascade reaction to form the bridged benzoxepin/aryl tetralin from a linear precursor in a single step. Modification of this route allowed the enantioselective synthesis of (+)-ovafolinins A and B, which confirmed the absolute stereochemistry, and comparison of optical rotation suggests that these compounds are found as scalemic mixtures in nature.
Total synthesis of (-)-bicubebin A, B, (+)-bicubebin C and structural reassignment of (-)-cis-cubebin
Davidson, Samuel J.,Pearce, A. Norrie,Copp, Brent R.,Barker, David
supporting information, p. 5368 - 5371 (2017/11/06)
The first total synthesis of (-)-bicubebin A, and two previously unreported dilignans, (-)-bicubebin B and (+)-bicubebin C has been achieved through the dimerization of (-)-cubebin, confirming the structure and absolute stereochemistry of (-)-bicubebin A. Analysis of the data for (-)-bicubebin B showed it matched that of reported compound (-)-cis-cubebin. The NMR data of the subsequently synthesized proposed structure of cis-cubebin confirmed that its original proposed structure was incorrect.
Nickel-Catalyzed Asymmetric Reductive Cross-Coupling to Access 1,1-Diarylalkanes
Poremba, Kelsey E.,Kadunce, Nathaniel T.,Suzuki, Naoyuki,Cherney, Alan H.,Reisman, Sarah E.
supporting information, p. 5684 - 5687 (2017/05/04)
An asymmetric Ni-catalyzed reductive cross-coupling of (hetero)aryl iodides and benzylic chlorides has been developed to prepare enantioenriched 1,1-diarylalkanes. As part of these studies, a new chiral bioxazoline ligand, 4-heptyl-BiOX (L1), was developed in order to obtain products in synthetically useful yield and enantioselectivity. The reaction tolerates a variety of heterocyclic coupling partners, including pyridines, pyrimidines, indoles, and piperidines.
