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177756-65-9

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177756-65-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 177756-65-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,7,7,5 and 6 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 177756-65:
(8*1)+(7*7)+(6*7)+(5*7)+(4*5)+(3*6)+(2*6)+(1*5)=189
189 % 10 = 9
So 177756-65-9 is a valid CAS Registry Number.

177756-65-9Relevant academic research and scientific papers

Norrish type II reactions of acyl azolium salts

Hopkinson, Matthew N.,Mavroskoufis, Andreas,Rieck, Arielle

, (2021/10/25)

The photochemical reactivity of acyl azolium salts derived from aliphatic carboxylic acids has been investigated. These species, which serve as models for intermediates generated in N-heterocyclic carbene (NHC) organocatalysis, undergo Norrish type II elimination reactions under irradiation with UVA light in analogy to structurally related aromatic ketones. Moreover, efficient Norrish-Yang cyclization was observed from an adamantyl-substituted derivative. These results further demonstrate the ability of NHCs to influence the absorption properties and photochemical reactivity of carbonyl groups during a catalytic cycle.

Manganese-Catalyzed Hydroarylation of Unactivated Alkenes

Liu, Ting,Wang, Congyang,Yang, Yunhui

supporting information, p. 14256 - 14260 (2020/07/13)

Transition-metal-catalyzed hydroarylation of unactivated alkenes with strategic use of remote coordinating functional groups has received significant attention recently to address the issues of both low reactivity and poor selectivity. The bidentate 8-aminoquinoline amide group is the most successfully adopted in unactivated alkenes for Pd and Ni catalysis. We describe the first manganese-catalyzed hydroarylation of unactivated alkenes bearing diverse simple functionalities with arylboronic acids. A series of δ- and γ-arylated amides, ketones, pyridines, and amines was accessed with excellent regioselectivity and in high yields. Hydroalkenylation of unactivated alkenes was also shown to be applicable under this manganese-catalysis regime. The method features earth-abundant manganese catalysis, easily available substrates, broad functional-group tolerance, and excellent regioselective control.

Enolizable β-Fluoroenones: Synthesis and Asymmetric 1,2-Reduction

Zygalski, Lukas,Middel, Christoph,Harms, Klaus,Koert, Ulrich

supporting information, p. 5071 - 5074 (2018/08/24)

The hydrofluorination of enolizable ynones with AgF in t-BuOH/DMF is reported. The formation of furans as side products can be suppressed using 2,2′-biphenol. The corresponding β-fluoroenones were obtained with good Z-selectivity. A variety of functional groups are tolerated. β-Fluoroenones are vinylogous acid fluorides whose hydrolysis to vinylogous acids can be avoided under the reported reaction conditions. The asymmetric 1,2-reduction of β-fluoroenones to 3-fluoroallylic alcohols is possible with pinacolborane and a Ni(0) catalyst prepared from a pyrimidyloxazoline ligand.

Photoredox Generation of Carbon-Centered Radicals Enables the Construction of 1,1-Difluoroalkene Carbonyl Mimics

Lang, Simon B.,Wiles, Rebecca J.,Kelly, Christopher B.,Molander, Gary A.

supporting information, p. 15073 - 15077 (2017/11/20)

Described is a facile, scalable route to access functional-group-rich gem-difluoroalkenes. Using visible-light-activated catalysts in conjunction with an arsenal of carbon-radical precursors, an array of trifluoromethyl-substituted alkenes undergoes radical defluorinative alkylation. Nonstabilized primary, secondary, and tertiary radicals can be used to install functional groups in a convergent manner, which would otherwise be challenging by two-electron pathways. The process readily extends to other perfluoroalkyl-substituted alkenes. In addition, we report the development of an organotrifluoroborate reagent to expedite the synthesis of the requisite trifluoromethyl-substituted alkene starting materials.

Gold-Catalyzed Dehydrogenative Cycloisomerization of 1,4-Enyne Esters to 3,5-Disubstituted Phenol Derivatives

Chen, Cuili,Chen, Xianxiao,Zhang, Xiaoxiang,Wang, Shifa,Rao, Weidong,Chan, Philip Wai Hong

supporting information, p. 4359 - 4368 (2017/12/26)

A method to prepare synthetically important 3,5-disubstituted phenol derivatives that relies on the sequential gold(I)-catalyzed dehydrogenative cycloisomerization of 1,4-enyne esters in the presence of 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) or N-fluorobenzenesulfonimide (NFSI) is described. The synthetic versatility of the methodology was exemplified by a gram-scale reaction of one example, the ease to realize subsequent functional transformations of an adduct, and the application of the method to the synthesis of the bioactive molecule LUF5771. (Figure presented.).

Pd(II)-Catalyzed Aerobic Intermolecular 1,2-Diamination of Conjugated Dienes: A Regio- and Chemoselective [4 + 2] Annulation for the Synthesis of Tetrahydroquinoxalines

Wu, Zhengxing,Wen, Ke,Zhang, Jingang,Zhang, Wanbin

supporting information, p. 2813 - 2816 (2017/06/07)

A Pd(II)-catalyzed aerobic intermolecular 1,2-diamination of conjugated dienes was developed for the regio- and chemoselective preparation of a variety of functionalized tetrahydroquinoxalines, using simple sulfonyl protected o-phenylendiamines as a nitrogen source. This methodology provides a direct and efficient synthesis of tetrahydroquinoxalines. O2 was used as the stoichiometric oxidant, and reaction conditions were applied to a series of o-phenylendiamines and conjugated dienes. 35 examples are described, and good yields and selectivities are obtained for the majority of the products.

Rhodium-catalyzed oxygenative addition to terminal alkynes for the synthesis of esters, amides, and carboxylic acids

Kim, Insu,Lee, Chulbom

supporting information, p. 10023 - 10026 (2013/10/01)

A gem of a couple: The title reaction of terminal alkynes with O and Nnucleophiles proceeds in the presence of [Rh(cod)Cl}2], P(4-FC 6H4)3, and 4-picoline N-oxide. Alcohols, amines, and water add to the terminal alkynes to give esters, amides, and carboxylic acids, respectively. The reaction involves formation of a rhodium vinylidene, oxidation to a ketene by oxygen transfer, and nucleophilic addition.

Stereoselectivity of intramolecular SN′ cyclizations of alkyllithium reagents on methoxy alkenes

La Cruz, Thomas E.,Rychnovsky, Scott D.

, p. 1068 - 1073 (2007/10/03)

The cyclization of alkyllithium reagents onto methoxy alkenes has been investigated. The alkyllithium reagent was generated by reductive lithiation of an alkyl nitrile. In an unbiased substrate, a methoxy leaving group attached to a stereogenic secondary

3-AMINO-2-HRYDROXYALKANOIC ACIDS AND THEIR PRODRUGS

-

Page 20-21, (2010/02/06)

Compounds having the formula are useful for treating conditions which arise from or are exacerbated by angiogenesis. Also disclosed are pharmaceutical compositions comprising the compounds, methods of treatment using the compounds, methods of inhibiting a

3-Amino-2-hydroxyalkanoic acids and their prodrugs

-

Page/Page column 10, (2010/02/07)

Compounds having the formula are useful for treating conditions which arise from or are exacerbated by angiogenesis. Also disclosed are pharmaceutical compositions comprising the compounds, methods of treatment using the compounds, methods of inhibiting a

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