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264218-65-7

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264218-65-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 264218-65-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,6,4,2,1 and 8 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 264218-65:
(8*2)+(7*6)+(6*4)+(5*2)+(4*1)+(3*8)+(2*6)+(1*5)=137
137 % 10 = 7
So 264218-65-7 is a valid CAS Registry Number.

264218-65-7Relevant articles and documents

Asymmetric total synthesis of (+)-cannabisativine

Kuethe, Jeffrey T.,Comins, Daniel L.

, p. 5219 - 5231 (2007/10/03)

The asymmetric total synthesis of natural (+)-cannabisativine 1 was completed in 19 steps and 7% overall yield. The key synthetic intermediate 29 was prepared with a high degree of stereocontrol in 12 steps starting from chiral 1-acylpyridinium salt 10. Addition of zinc enolate 11 to pyridinium salt 10 furnished dihydropyridone 12 containing two contiguous stereocenters of the correct absolute configuration. Luche reduction of ketone 16 afforded diol 17 in high yield (96%) and excellent diastereoselectivity. The Mukaiyama-Michael reaction of pyridones 27a/b with O-silyl ketene acetal 32 gave phenyl selenyl ketones 33a/b with complete stereoselectivity. Elimination of cis-β-hydroxyselenides 34 and 35 effected the regiocontrolled preparation of tetrahydropyridine derivative 29. Several approaches to the macrocyclic ring closure of the 13-membered ring were investigated, ultimately leading to the completion of an asymmetric synthesis of the target compound with a high degree of stereocontrol.

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