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83022-81-5

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83022-81-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 83022-81-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,0,2 and 2 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 83022-81:
(7*8)+(6*3)+(5*0)+(4*2)+(3*2)+(2*8)+(1*1)=105
105 % 10 = 5
So 83022-81-5 is a valid CAS Registry Number.

83022-81-5Relevant articles and documents

Total Synthesis and Structure Revision of (-)-Illisimonin A, a Neuroprotective Sesquiterpenoid from the Fruits of Illicium simonsii

Burns, Alexander S.,Rychnovsky, Scott D.

, p. 13295 - 13300 (2019)

Illisimonin A was isolated from Illicium simonsii and has a previously unreported tricyclic carbon framework. It displayed neuroprotective effects against oxygen-glucose deprivation-induced cell injury in SH-SY5Y cells. It incorporates a highly strained trans-pentalene ring system. We report the first synthesis of (±)-illisimonin A. Notable steps in the route include a 1,3-dioxa-2-silacyclohexene templated Diels-Alder cycloaddition and type-3 semipinacol rearrangement to generate the trans-pentalene. The final step is an iron-catalyzed C-H oxidation. The synthetic route is robust, with 94 mg of racemic material prepared in a single pass. Resolving an intermediate enabled the synthesis of natural (-)-illisimonin A. The absolute configuration of (-)-illisimonin A was revised to 1S,4S,5S,6S,7R,9R,10R based on the X-ray structure of a heavy-atom analogue.

Unexpected MIMIRC Annulation Between a Lithium Dienolate and Methyl Acrylate

Jaafar, Akram,Alilou, El Houssine,Reglier, Marius,Waegell, Bernard

, p. 5531 - 5534 (2007/10/02)

We describe an unusual MIMIRC reaction between a lithium dienolate 6 and methyl acrylate.The more classical double Michael addition cyclisation provides an efficient entry towards key intermediate 5 for 2-isocyanopupukeanane 1 synthesis.

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