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454253-77-1

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454253-77-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 454253-77-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,5,4,2,5 and 3 respectively; the second part has 2 digits, 7 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 454253-77:
(8*4)+(7*5)+(6*4)+(5*2)+(4*5)+(3*3)+(2*7)+(1*7)=151
151 % 10 = 1
So 454253-77-1 is a valid CAS Registry Number.

454253-77-1Upstream product

454253-77-1Downstream Products

454253-77-1Relevant articles and documents

A general method for the asymmetric synthesis of both enantiomers of 1-substituted 1,2,3,4-tetrahydro-β-carbolines employing pyroglutamic acid derivatives as chiral auxiliaries

Itoh, Takashi,Miyazaki, Michiko,Ikeda, Sachiko,Nagata, Kazuhiro,Yokoya, Masashi,Matsuya, Yuji,Enomoto, Yasuko,Ohsawa, Akio

, p. 3527 - 3536 (2003)

9-(S)-Pyroglutaminyl-β-carbolines were allowed to react with a nucleophile (allyltributyltin or a silyl enol ether) in the presence of 2,2,2-trichloroethyl chloroformate to give 1,2-addition products in good yields and high diastereoselectivity. The chiral auxiliary at N-9 was readily removed by a mild hydrolysis. The same chiral source afforded both enantiomers by simply altering a protecting group of the amide nitrogen. That is, (S)-pyroglutaminyl groups which had an N-alkyl group afforded the (S) isomer, whereas the ones having an N-acyl group produced the (R) isomer of the addition products.

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