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643751-42-2

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643751-42-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 643751-42-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,3,7,5 and 1 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 643751-42:
(8*6)+(7*4)+(6*3)+(5*7)+(4*5)+(3*1)+(2*4)+(1*2)=162
162 % 10 = 2
So 643751-42-2 is a valid CAS Registry Number.

643751-42-2Downstream Products

643751-42-2Relevant articles and documents

Method for preparing pharmaceutical intermediate of tryptophan derivative

-

, (2021/09/21)

The synthesis method comprises the following steps: L - tryptophan derivatives are taken as starting materials, and esterification is carried out in sequence. The amidation, Boc protection, hydrolysis, amidation or sequential esterification, amidation, Boc protection, hydrogenation, hydrolysis, amidation yields a target product, a tryptophan derivative pharmaceutical intermediate. The preparation method has the advantages of cheap and easily available raw materials, environment friendliness, less process three wastes, accords with the idea of green pharmacy, mild reaction conditions, simple process, simple and convenient operation, high yield and purity and easy amplification and production.

Copper-catalyzed cyclization of lodo-tryptophans: A straightforward synthesis of pyrroloindoles

Coste, Alexis,Toumi, Mathieu,Wright, Karen,Razafimahaleo, Vanessa,Couty, Francois,Marrot, Jerome,Evano, Gwilherm

supporting information; experimental part, p. 3841 - 3844 (2009/07/01)

(Chemical Equation Presented) Pyrroloindoles are a key structural motif found in a wide number of biologically active alkaloids. Intramolecular copper-catalyzed coupling of readily accessible 2-iodo-tryptophan derivatives occurs in excellent yield, afford

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