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858520-89-5

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858520-89-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 858520-89-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,5,8,5,2 and 0 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 858520-89:
(8*8)+(7*5)+(6*8)+(5*5)+(4*2)+(3*0)+(2*8)+(1*9)=205
205 % 10 = 5
So 858520-89-5 is a valid CAS Registry Number.

858520-89-5Relevant articles and documents

Scalable Total Syntheses of Some Natural and Unnatural Lamellarins: Application of a One-Pot Domino Process for Regioselective Access to the Central 1,2,4-Trisubstituted Pyrrole Core

Kumar, Virendra,Awasthi, Annapurna,Salam, Abdus,Khan, Tabrez

, p. 11596 - 11603 (2019/10/02)

Short and scalable total syntheses of lamellarin G trimethyl ether, lamellarin D trimethyl ether, lamellarin H, lamellarin ?, dihydrolamellarin ?, and lamellarin U have been realized in four to six linear steps with an overall yield of ≤22%. Highlights of

Total synthesis of natural and unnatural lamellarins with saturated and unsaturated D-rings

Ploypradith, Poonsakdi,Petchmanee, Thaninee,Sahakitpichan, Poolsak,Litvinas, Nichole D.,Ruchirawat, Somsak

, p. 9440 - 9448 (2007/10/03)

(Chemical Equation Presented) Twenty-eight natural and unnatural lamellarins with either a saturated or an unsaturated D-ring were synthesized according to our developed synthetic route. The key step involved the Michael addition/ring closure (Mi-RC) of the benzyldihydroisoquinoline and α-nitrocinnamate derivatives, which provided the 2-carboethoxypyrrole intermediates in moderate to good yields (up to 78% yield). Subsequent hydrogenolysis/lactonization furnished lamellarins with a saturated D-ring in excellent yields (up to 93% yield). DDQ oxidation of the saturated lamellarin acetates led directly to the corresponding unsaturated analogues in 54-95% yield. In addition, only two steps in our developed strategy require column chromatography.

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