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57850-05-2

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57850-05-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 57850-05-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,8,5 and 0 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 57850-05:
(7*5)+(6*7)+(5*8)+(4*5)+(3*0)+(2*0)+(1*5)=142
142 % 10 = 2
So 57850-05-2 is a valid CAS Registry Number.

57850-05-2Relevant articles and documents

Design, synthesis, and electrophysiological evaluation of NS6740 derivatives: Exploration of the structure-activity relationship for alpha7 nicotinic acetylcholine receptor silent activation

Pismataro, Maria Chiara,Horenstein, Nicole A.,Stokes, Clare,Quadri, Marta,De Amici, Marco,Papke, Roger L.,Dallanoce, Clelia

, (2020/08/19)

The α7 nicotinic acetylcholine receptor (nAChR) silent agonists, able to induce receptor desensitization and promote the α7 metabotropic function, are emerging as new promising therapeutic anti-inflammatory agents. Herein, we report the structure–activity

A smooth rearrangement of N-p-toluenesulfonyl 2-tert- butyldiphenylsilylmethyl-substituted azetidines into N-p-toluenesulfonyl 3-tert-butyldiphenylsilyl-substituted pyrrolidines

Narhe, Bharat D.,Sriramurthy, Vardhineedi,Yadav, Veejendra K.

experimental part, p. 4390 - 4399 (2012/07/14)

The rearrangement of N-p-toluenesulfonyl 2-tert-butyldiphenylsilylmethyl- substituted azetidines into 3-tert-butyldiphenylsilyl-substituted pyrrolidines under Lewis acid conditions in dichloromethane involves 1,2-migration of silicon through a siliranium ion. The formation of siliranium ion was discovered not to be in concert with σC-N cleavage from stereochemical analysis of the pyrrolidine products formed from 3- and 4-substituted-2-tert- butyldiphenylsilylmethyl azetidines and also from the optical rotation data and chiral HPLC analysis of the pyrrolidine product formed from N-p-toluenesulfonyl 2(R)-tert-butyldiphenylsilylmethyl azetidine. The formation of sterically less hindered siliranium ion is followed by its SN2 opening by the internal nitrogen nucleophile. Oxidative cleavage of σC-Si bond leads to the formation of 3-hydroxypyrrolidines.

Fluoronaphthyridines and -quinolines as Antibacterial Agents. 5. Synthesis and Antimicrobial Activity of Chiral 1-tert-Butyl-6-fluoro-7-substituted-naphthyridones

Cesare, P. Di,Bouzard, D.,Essiz, M.,Jacquet, J. P.,Ledoussal, B.,et al.

, p. 4205 - 4213 (2007/10/02)

A series of novel 7-substituted-1-tert-butyl-6-fluoronaphthyridone-3-carboxylic acids has been prepared.These derivatives are characterized by chiral aminopyrrolidine substituents at the 7 position.In this paper we report the full details of the asymmetric synthesis of this series of compounds.Structure-activity relationship studies indicate that the absolute stereochemistry at the asymmetric centers of the pyrrolidine ring is critical for maintaining good activity.Compounds 60 and 61 (3-amino-4-methylpyrrolidine enantiomers) were selected for preclinical evaluation.

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