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1377495-54-9

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1377495-54-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1377495-54-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,7,7,4,9 and 5 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 1377495-54:
(9*1)+(8*3)+(7*7)+(6*7)+(5*4)+(4*9)+(3*5)+(2*5)+(1*4)=209
209 % 10 = 9
So 1377495-54-9 is a valid CAS Registry Number.

1377495-54-9Relevant articles and documents

Synthesis of the AB-DE ring system present in the alstoscholarine alkaloids

Polindara-Garcia, Luis A.,Miranda, Luis D.

, p. 1051 - 1056 (2012)

A practical protocol is presented for the construction of the AB-DE rings present in (19,20)-(E)- and (19,20)-(Z)-alstoscholarine alkaloids from the commercially available glutamic acid 5-methyl ester, employing only a six-step synthetic sequence. The main features include the synthesis of the alkynylindolizinone core and the use of Sonogashira cross-coupling and base-mediated cyclization to afford a 2-substituted indole without the use of protecting groups. Georg Thieme Verlag Stuttgart · New York.

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