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944128-08-9

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944128-08-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 944128-08-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,4,4,1,2 and 8 respectively; the second part has 2 digits, 0 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 944128-08:
(8*9)+(7*4)+(6*4)+(5*1)+(4*2)+(3*8)+(2*0)+(1*8)=169
169 % 10 = 9
So 944128-08-9 is a valid CAS Registry Number.

944128-08-9Downstream Products

944128-08-9Relevant articles and documents

Asymmetric synthesis of 6-alkyl- And 6-arylpiperidin-2-ones. Enantioselective synthesis of (S)-(+)-coniine

Lebrun, Stephane,Couture, Axel,Deniau, Eric,Grandclaudon, Pierre

, p. 2473 - 2476 (2008/02/05)

A variety of diolefinic hydrazides (1) have been assembled in a highly diastereoselective manner by addition of allyllithium to chiral SAMP hydrazones followed by N-acylation with acryloyl chloride. Substrates 1 undergo ring-closing metathesis to give the cyclic enehydrazides (5) which can be easily converted into virtually enantlopure 6-alkyl- or 6-arylpiperidin-2-ones (7). The versatility of this hydrazone addition-RCM protocol has been further exemplified by the conversion of the unsaturated heterocycle 5b into the piperidine alkaloid (S)-(+)-coniine.

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