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177906-37-5

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177906-37-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 177906-37-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,7,9,0 and 6 respectively; the second part has 2 digits, 3 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 177906-37:
(8*1)+(7*7)+(6*7)+(5*9)+(4*0)+(3*6)+(2*3)+(1*7)=175
175 % 10 = 5
So 177906-37-5 is a valid CAS Registry Number.

177906-37-5Downstream Products

177906-37-5Relevant articles and documents

Total syntheses of spidamine and joramine, polyamine toxins from the joro spider, Nephila clavata

Chiba, Tadashige,Akizawa, Toshifumi,Matsukawa, Motomi,Nishi, Masatoshi,Kawai, Nobufumi,Yoshioka, Masanori

, p. 972 - 979 (2007/10/03)

In order to confirm the structures of spidamine and joramine, identified from the venom of a spider (nephila clavata), we convergently synthesized both compounds, which have a common side chain of N-(L-asparaginyl)-N'-(3- aminopropyl-β-alanyl)-1,5-pentanediamine. A synthon of the common side chain was synthesized by starting with n-propanolamine which was converted to 7- azido-N-benzyloxycarbonyl-4-azaheptanoic acid N-hydroxysuccinimidyl ester. The ester was coupled with tert-butyloxycarbonyl-L-asparaginyl-1,5- pentanediamine to give the synthon of the common side chain. In the final synthesis of spidamine, the synthon of the common side chain was reacted with 2,4-dibenzyloxyphenylacetic acid N-hydroxysuccinimidyl ester, obtained by Willgerodt-kindler reaction of 2,4-dihydroxyacetophenone. The protected spidamine was catalytically hydrogenated to remove protective groups, affording spidamine itself in 13% yield from n-propanolamine. In the final synthesis of joramine, the synthon of the common side chain was reacted with 4-benzyloxyphenyl acetic acid N-hydroxysuccinimidyl ester. The protected joramine was also catalytically hydrogenated to produce joramine itself in 11% yield. The conformations of both synthesized compounds were analyzed by 1H-NMR and 13C-NMR. Their blocking activities on glutamate receptors were examined using lobster neuromuscular synapses.

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