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577747-81-0

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577747-81-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 577747-81-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,7,7,7,4 and 7 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 577747-81:
(8*5)+(7*7)+(6*7)+(5*7)+(4*4)+(3*7)+(2*8)+(1*1)=220
220 % 10 = 0
So 577747-81-0 is a valid CAS Registry Number.

577747-81-0Relevant articles and documents

Synthesis of Natural Ecteinascidins (ET-729, ET-745, ET-759B, ET-736, ET-637, ET-594) from Cyanosafracin B

Menchaca, Roberto,Martinez, Valentin,Rodriguez, Alberto,Rodriguez, Natividad,Flores, Maria,Gallego, Pilar,Manzanares, Ignacio,Cuevas, Carmen

, p. 8859 - 8866 (2003)

The semisynthetic process initially described for the synthesis of 1 (ET-743) has been extended to the preparation of other natural ecteinascidins. For the synthesis of 2 (ET-729) a demethylation of a N-Me intermediate was carried out by a selective oxidation with MCPBA. Other natural ecteinascidins (ET-745, ET-759B, ET-736, ET-637, ET-594) were accessible from key intermediate 25. The described methodologies allow for the preparation of a wide variety of ecteinascidins by procedures that can be easily scaled up.

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