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257628-68-5

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257628-68-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 257628-68-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,7,6,2 and 8 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 257628-68:
(8*2)+(7*5)+(6*7)+(5*6)+(4*2)+(3*8)+(2*6)+(1*8)=175
175 % 10 = 5
So 257628-68-5 is a valid CAS Registry Number.

257628-68-5Relevant articles and documents

Tunable Synthesis of α-Amino Boronic Esters from Available Aldehydes and Amines through Sequential One-Pot Dehydration and Copper-Catalyzed Borylacylation

Xia, Qi,Chang, Hua-Rong,Li, Juan,Wang, Jia-Yi,Peng, Yan-Qing,Song, Gong-Hua

, p. 2716 - 2724 (2020/01/31)

Copper-catalyzed multicomponent borylacylation of imines with acid chlorides and bis(pinacolato)diboron was developed for the preparation of synthetically useful and pharmacologically relevant α-amino boronic acid derivatives. Starting from a range of acid chlorides and imines with aryl, heteroaryl, and alkyl substituents, most of these ligand-free reactions proceeded smoothly at room temperature in moderate to good yields. Furthermore, a facile and convenient one-pot, multistep access to the direct synthesis of α-amino boronic acid derivatives from available aldehydes and amines was also developed.

Regioselective Cu(I)-catalyzed tandem A3-coupling/ decarboxylative coupling to 3-amino-1,4-enynes

Feng, Huangdi,Ermolat'Ev, Denis S.,Song, Gonghua,Van Der Eycken, Erik V.

supporting information; experimental part, p. 1942 - 1945 (2012/05/31)

An efficient and novel copper-mediated protocol for the synthesis of 3-amino-1,4-enynes from glyoxylic acid, an amine, and an alkyne was developed. This new reaction involving two sequential C-C bond formations is air and moisture tolerant and proceeds via a tandem A3-coupling and a selective decarboxylative coupling.

COMPOUNDS FOR IMPROVING LEARNING AND MEMORY

-

Page/Page column 3; 19, (2009/12/23)

The present invention provides a compound of Formula I: (I) and methods for improving memory in a subject by administering a therapeutically effective amount of the compound.

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