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442531-80-8

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442531-80-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 442531-80-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,2,5,3 and 1 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 442531-80:
(8*4)+(7*4)+(6*2)+(5*5)+(4*3)+(3*1)+(2*8)+(1*0)=128
128 % 10 = 8
So 442531-80-8 is a valid CAS Registry Number.

442531-80-8Relevant articles and documents

Unified Approach to the Spiro(pyrrolidinyl-oxindole) and Hexahydropyrrolo[2,3-b]indole Alkaloids: Total Syntheses of Pseudophrynamines 270 and 272A

De, Subhadip,Das, Mrinal Kanti,Bhunia, Subhajit,Bisai, Alakesh

, p. 5922 - 5925 (2015/12/11)

The first enantioselective total syntheses of architecturally interesting prenylated pyrroloindole alkaloids, (-)-pseudophrynamines 272A (3d) and 270 (3b), have been achieved starting from enantioenriched 2-oxindoles having all-carbon quaternary stereocenters. A common strategy involving a thio-urea catalyzed aldol reaction is employed for the total synthesis of both spiro(pyrrolidinyl-oxindole) and hexahydropyrrolo[2,3-b]indole alkaloids.

Biogenetic-type synthesis of the Calycanthaceous alkaloids.

Hall,McCapra,Scott

, p. 4131 - 4141 (2007/10/04)

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