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131666-50-7

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131666-50-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 131666-50-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,6,6 and 6 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 131666-50:
(8*1)+(7*3)+(6*1)+(5*6)+(4*6)+(3*6)+(2*5)+(1*0)=117
117 % 10 = 7
So 131666-50-7 is a valid CAS Registry Number.

131666-50-7Relevant articles and documents

Application of chiral 2-isoxazoline for the synthesis of syn-1,3-diol analogs

Feng, Juanjuan,Li, Tianyu,Zhang, Jiaxin,Jiao, Peng

, p. 1840 - 1847 (2019)

The asymmetric cycloaddition of TIPS nitronate catalyzed by “Cu(II)-bisoxazoline” gave the 2-isoxazoline product in 95% yield, which was converted into tert-butyl (3S,5R)-6-hydroxy-3,5-O-isopropylidene-3,5-dihydroxyhexanoate in 14 steps through a β-hydroxy ketone.

PROCESS FOR PREPARING OPTICALLY ACTIVE 2- 6-(HYDROXY-METHYL)-1,3-DIOXAN-4-YL]ACETIC ACID DERIVATIVES

-

, (2008/06/13)

The present invention is to provide a production technology by which an optically active 2-[6-(hydroxymethyl)-1,3-dioxan-4-yl]acetic acid derivative, which are of value as pharmaceutical intermediates, can be produced from inexpensive and readily available starting materials without using any extraordinary equipment such as an ultra-low-temperature reactor. The present invention is a production process of an optically active 2-[6-(hydroxymethyl)-1,3-dioxan-4-yl]acetic acid derivative ???which comprises reacting an enolate, prepared by permitting a base or a 0-valent metal to act on an acetic acid ester derivative with (S)-β-hydroxy-γ-butyrolactone at a temperature not lower than -30°C to give a dihydroxyoxohexanoic acid derivative, ???treating the same with an acylating agent in the presence of a base to produce a dihydroxyoxohexanoic acid monoacyl derivative, ???reducing this compound with a microorganism to produce a trihydroxyhexanoic acid monoacyl derivative, ???treating this compound with an acetal-forming reagent in the presence of an acid catalyst to produce an acyloxymethyldioxanylacetic acid derivative, and ???finally, subjecting this compound to solvolysis in the presence of a base.

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