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799561-66-3

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799561-66-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 799561-66-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,9,9,5,6 and 1 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 799561-66:
(8*7)+(7*9)+(6*9)+(5*5)+(4*6)+(3*1)+(2*6)+(1*6)=243
243 % 10 = 3
So 799561-66-3 is a valid CAS Registry Number.

799561-66-3Downstream Products

799561-66-3Relevant articles and documents

Asymmetric synthesis of pyrrolidinoindolines. Application for the practical total synthesis of (-)-phenserine

Huang, Audris,Kodanko, Jeremy J.,Overman, Larry E.

, p. 14043 - 14053 (2007/10/03)

A versatile route to enantiopure 3,3-disubstituted oxindoles and 3a-substituted pyrrolidinoindolines is described in which diastereoselective dialkylation of enantiopure ditriflate 10 with oxindole enolates is the central step. These reactions are rare examples of alkylations of prostereogenic enolates with chiral sp3 electrophiles that proceed with high facial selectivity (10-20:1). The scope of this method is explored, and a model to rationalize the sense of stereoselection is advanced. This dialkylation chemistry was used to synthesize (-)-phenserine on a multigram scale in six steps and 43% overall yield from 5-methoxy-1,3-dimethyloxindole (27) and to complete a short formal total synthesis of (-)-physostigmine (2).

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