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136612-59-4

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136612-59-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 136612-59-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,6,6,1 and 2 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 136612-59:
(8*1)+(7*3)+(6*6)+(5*6)+(4*1)+(3*2)+(2*5)+(1*9)=124
124 % 10 = 4
So 136612-59-4 is a valid CAS Registry Number.

136612-59-4Downstream Products

136612-59-4Relevant articles and documents

Potential intermediate, (±)-di-o-acetyl-3α-phenylselanyl-3,3a-dihydro-B-nor-6,7a- secolycorin-5-one for synthesis of the Amaryllidaceae alkaloid lycorine: Formal and total syntheses of (±)-lycorine

Hoshino, Osamu,Ishizaki, Miyuki,Kamei, Keisuke,Taguchi, Minoru,Nagao, Takashi,Iwaoka, Kiyoshi,Sawaki, Shohei,Umezawa, Bunsuke,Iitaka, Yoichi

, p. 571 - 580 (2007/10/03)

Formal and total syntheses of the Amaryllidaceae alkaloid, (±)-lycorine 1, were achieved by new synthetic routes via (±)-di-o-acetyl-3α-phenylselanyl-3,3a-dihydro-B-nor-6,7a- secolycorin-5-one 32. Namely, stereoselective intramolecular Diels-Alder reaction of triene ester 5 afforded, in good yield, the cis-lactone 6, which was converted into β(stereochemical)-hydroxy-γ-lactam 23. Oxidation of silyl ether 24 with m-chloroperbenzoic acid gave only β-(tert-butyldimethylsiloxy)-α-epoxide 25, the stereostructure of which was determined by its X-ray crystallographic analysis. Payne rearrangement of compound 25 and successive acetylation furnished α(stereochemical)-acetoxy-β(stereochemical)-epoxy γ-lactam 29, which was transformed into (±)-lycorine 1 by construction of the B ring. Formal total synthesis of (±)-lycorine 1 is also described.

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