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181769-06-2

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181769-06-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 181769-06-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,1,7,6 and 9 respectively; the second part has 2 digits, 0 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 181769-06:
(8*1)+(7*8)+(6*1)+(5*7)+(4*6)+(3*9)+(2*0)+(1*6)=162
162 % 10 = 2
So 181769-06-2 is a valid CAS Registry Number.

181769-06-2Downstream Products

181769-06-2Relevant articles and documents

Total synthesis of (±)-deethylibophyllidine: Studies of a Fischer indolization route and a successful approach via a Pummerer rearrangement/thionium ion-mediated indole cyclization

Bonjoch, Josep,Catena, Juanlo,Valls, Nativitat

, p. 7106 - 7115 (1996)

The total synthesis of (±)-deethylibophyllidine is described, proceeding in eight steps from 4-(methoxyphenyl)ethylamine in 5% overall yield (Scheme 6). In terms of sequential annulation, the strategy involves the following operations: E → DE → ABDE → ABCDE (Scheme 1). The key steps in the synthesis are the stereoselective formation of octahydroindol-6-ones by acid treatment of dihydroanisole derivatives, the regioselective Fischer indolization to obtain octahydropyrrolo[3,2-c]carbazoles, and the tandem process consisting of Pummerer rearrangement upon a β-amino sulfoxide and thionium ion cyclization upon a β-indole position of a 2,3-disubstituted indole to generate the quaternary spiro center. Attempts to effect the construction of the pentacyclic framework by means of Fischer indolization of the octahydropyrrolo[3,2,1-hi]indol-6-one resulted in failure (Scheme 2).

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