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220230-81-9

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220230-81-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 220230-81-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,0,2,3 and 0 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 220230-81:
(8*2)+(7*2)+(6*0)+(5*2)+(4*3)+(3*0)+(2*8)+(1*1)=69
69 % 10 = 9
So 220230-81-9 is a valid CAS Registry Number.

220230-81-9Relevant articles and documents

Cu/Mn Co-oxidized cyclization for the synthesis of highly substituted pyrrole derivatives from amino acid esters: A strategy for the biomimetic syntheses of lycogarubin c and chromopyrrolic acid

Zhou, Nini,Xie, Tao,Liu, Lin,Xie, Zhixiang

, p. 6061 - 6068 (2014/07/21)

An effective and concise approach to synthesis of tetrasubstituted pyrroles from readily available amino acid esters by the promotion of Cu(OAc) 2 in conjunction with Mn(OAc)3 has been developed. This reaction proceeds through multiple dehydrogenations, deamination, and oxidative cyclization. This oxidized system tolerates substrates bearing various electron-donating or electron-withdrawing groups. With this methodology, several key intermediates of natural products have been effectively prepared, and the total syntheses of lycogarubin C and chromopyrrolic acid have been completed in high efficiency.

Total syntheses of ningalin A, lamellarin O, lukianol A, and permethyl storniamide A utilizing heterocyclic azadiene Diels - Alder reactions

Boger, Dale L.,Boyce, Christopher W.,Labroli, Marc A.,Sehon, Clark A.,Jin, Qing

, p. 54 - 62 (2007/10/03)

Concise, efficient total syntheses of ningalin A (1), lamellarin O (2), lukianol A (3), and permethyl storniamide A (5) are detailed on the basis of a common heterocyclic azadiene Diels-Alder strategy (1,2,4,5-tetrazine → 1,2-diazine → pyrrole) ideally suited for construction of the densely functionalized pyrrole cores found in the three classes of marine natural products. Examination of the natural products and a number of synthetic intermediates revealed that some including lamellarin O (2) and lukianol A (3) exhibit modest cytotoxic activity against both wild-type and multidrug- resistant tumor cell lines. Fundamentally more important, a new class of agents including permethyl storniamide A (5) and its precursor 30, which lack inherent cytotoxic activity, are disclosed which reverse the multidrug- resistant (MDR) phenotype, resensitizing a human colon cancer cell line (HCT116/VM46) to vinblastine and doxorubicin at lower doses than the prototypical agent verapamil.

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