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1026294-20-1

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1026294-20-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1026294-20-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,2,6,2,9 and 4 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1026294-20:
(9*1)+(8*0)+(7*2)+(6*6)+(5*2)+(4*9)+(3*4)+(2*2)+(1*0)=121
121 % 10 = 1
So 1026294-20-1 is a valid CAS Registry Number.

1026294-20-1Relevant articles and documents

Cyclization strategies for the synthesis of macrocyclic bisindolylmaleimides

Faul,Krumrich

, p. 2024 - 2033 (2007/10/03)

Three new approaches to the synthesis of macrocyclic bisindolylmaleimides 1-4 have been identified. Two strategies afford 8, the penultimate intermediate for the synthesis of 1-4, in 73% and 32% yield by intramolecular cyclization of 31 and 40, respectively. The optimum synthesis of 1 was achieved in nine steps and 15% yield by intramolecular formation of the macrocycle and maleimide in one step by reaction of the sodium indolate of 12 with methyl indole-3-glyoxylate 47. The mechanism of this reaction has been elucidated, using the trityl-protected derivative, to involve initial formation of the tricarbonyl imide 48, followed by irreversible alkylation of the indole nitrogen to generate the 17-membered macrocycle 49. Cyclization of 49 to hydroxymaleimide 50 and subsequent dehydration afforded 8a. This approach eliminated the problem of dimerization observed in the intramolecular cyclization reactions.

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