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179748-56-2

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179748-56-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 179748-56-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,9,7,4 and 8 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 179748-56:
(8*1)+(7*7)+(6*9)+(5*7)+(4*4)+(3*8)+(2*5)+(1*6)=202
202 % 10 = 2
So 179748-56-2 is a valid CAS Registry Number.

179748-56-2Relevant articles and documents

Lipase-mediated synthesis of enantiopure N-carbobenzoxy-3-hydroxy- 1,2,3,4-tetrahydro- and N-carbobenzoxy-3-hydroxy-1,2,3,6-tetrahydropyridines from 3-hydroxypyridine

Sakagami, Hideki,Ogasawara, Kunio

, p. 521 - 524 (2000)

Two isomeric chiral hydroxytetrahydropyridines, having high potential utility for the construction of a variety of chiral amine derivatives, have been prepared in both enantiomeric forms by employing lipase-mediated resolution starting from 3-hydroxypyridine. Thus, on exposure to sodium borohydride in the presence of carbobenzoxy chloride, 3-hydroxypyridine has been found to furnish racemic N-carbobenzoxy-3-hydroxy-1,2,3,4- tetrahydropyridine, which is resolved under trans-esterification conditions in the presence of lipase PS to give both enantiomeric products in enantiopure forms. Isomerization of the chiral 1,2,3,4-tetrahydro-product into the chiral 1,2,3,6-tetrahydro-derivative has been accomplished without loss of the original chiral integrity. The racemic 1,2,3,6-tetrahydro- derivative has also been resolved under the same lipase-mediated trans- esterification conditions.

Diastereoselective synthesis of 3,5-trans-(+)-(3R,5R)-3-carbomethoxycarbapenam from 3-hydroxypyridine: Questioning the stereochemical assignment of the natural product

Tanaka, Hideyuki,Sakagami, Hideki,Ogasawara, Kunio

, p. 93 - 96 (2007/10/03)

An enantio- and diastereoselective synthesis of the methyl ester of 3,5-trans-(3R,5R)-carbapenam-3-carboxylic acid from 3-hydroxypyridine via (2R,5S)-trans-5-acetoxy-2-allylpiperidine has been achieved by employing the piperidine-pyrrolidine ring-contract

Novel reduction of 3-hydroxypyridine and its use in the enantioselective synthesis of (+)-pseudoconhydrine and (+)-N-methylpseudoconhydrine

Sakagami, Hideki,Kamikubo, Takashi,Ogasawara, Kunio

, p. 1433 - 1434 (2007/10/03)

3-Hydroxypyridine is reduced with sodium borohydride in the presence of benzyl chloroformate to give 1-benzyloxycarbonyl-5-hydroxy-2-piperideine which is transformed into (+)-pseudoconhydrine and (+)-N-methylpseudoconhydrine in five steps involving a lipa

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