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136057-73-3

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136057-73-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 136057-73-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,6,0,5 and 7 respectively; the second part has 2 digits, 7 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 136057-73:
(8*1)+(7*3)+(6*6)+(5*0)+(4*5)+(3*7)+(2*7)+(1*3)=123
123 % 10 = 3
So 136057-73-3 is a valid CAS Registry Number.

136057-73-3Relevant articles and documents

Asymmetric construction of two contiguous stereocenters by diastereoface differentiating addition reaction of thiols to chiral imides: Formal synthesis of (+)-diltiazem

Miyata, Okiko,Shinada, Tetsuro,Ninomiya, Ichiya,Naito, Takeaki

, p. 2421 - 2438 (2007/10/03)

A high degree of diastereoselectivity has been achieved on the asymmetric construction of two contiguous stereocenters by the conjugate addition of thiols to α,β-unsaturated imides possessing Evans's chiral auxiliary. Addition reactions of thiophenol to chiral E- and Z-2-methylcrotonyl imides 4 proceeded with high diastereoface selectivities. Diastereoselectivities were discussed when E- and Z-imides 4 and 5 were used as the substrates. A successful application was demonstrated by the formal synthesis of a clinically useful cardiac drug, (+)-diltiazem.

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