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152896-80-5

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152896-80-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 152896-80-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,2,8,9 and 6 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 152896-80:
(8*1)+(7*5)+(6*2)+(5*8)+(4*9)+(3*6)+(2*8)+(1*0)=165
165 % 10 = 5
So 152896-80-5 is a valid CAS Registry Number.

152896-80-5Relevant articles and documents

Total synthesis of patulolide C and its homo, nor, and iso analogs

Leemhuis,Thijs,Zwanenburg

, p. 7170 - 7179 (2007/10/02)

The stereospecific total synthesis of the naturally occurring macrolide patulolide C 19Eb as well as its iso, nor, and homo analogs is described by applying the photoinduced rearrangement of enantiomerically pure epoxy diazomethyl ketones 14 to γ-hydroxy α,β-unsaturated esters 15 as the key step. The required epoxy diazomethyl ketones 14 are obtained by a Sharpless epoxidation of an appropriate allylic alcohol, followed by ruthenium tetraoxide oxidation to an oxiranecarboxylic acid, conversion into amixed anhydride, and treatment with diazomethane. Macrolide 19Zb, which is a geometrical isomer of 19Eb, turned out to be a diastereomer of natural macrolide isopatulolide C, which implies the 4R,11R configuration for this natural material. X-ray diffraction analyses of 19Ea and 19Eb show that there is a considerable difference in spatial arrangement; particularly, the different torsion angles between the carbonyl and olefinic bonds are noteworthy. The conformational behavior of these macrolides is also deduced from the NMR and UV spectra.

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