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134931-64-9

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134931-64-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 134931-64-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,4,9,3 and 1 respectively; the second part has 2 digits, 6 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 134931-64:
(8*1)+(7*3)+(6*4)+(5*9)+(4*3)+(3*1)+(2*6)+(1*4)=129
129 % 10 = 9
So 134931-64-9 is a valid CAS Registry Number.

134931-64-9Relevant articles and documents

Enantioselective Darzens reaction: Asymmetric synthesis of trans-glycidic esters mediated by chiral lithium amides

Takahashi,Muraoka,Capo,Koga

, p. 1821 - 1823 (1995)

Enantioselective and diastereoselective Darzens reaction mediated by chiral lithium amides was achieved between tert-butyl chloroacetate and aromatic aldehydes to give the corresponding trans-glycidic esters in up to 84% enantiomeric excess.

Efficient alternative synthetic route to diltiazem via (2R,3S)-3-(4- methoxyphenyl)glycidamide

Yamada, Shin-ichi,Tsujioka, Ikuko,Shibatani, Takeji,Yoshioka, Ryuzo

, p. 146 - 150 (2007/10/03)

An effective new route to diltiazem, a representative coronary vasodilator, through (-)-(2R,3S)-3-(4-methoxyphenyl)glycidamide [(-)-2] has been achieved. The glycidamide (-)-2 was prepared in 43% overall yield by a combination of the enzymatic resolution of methyl (±)2(2RS,3SR)-3-(4- methoxyphenyl)glycidate [(±)-1] with lipase and the following amidation of (-)-1 with ammonia. A one-pot synthesis through the treatment of (-)-2 with 2-aminothiophenol and a following ring closing reaction efficiently gave a key intermediate of diltiazem synthesis, (2S,3S)-2,3-dihydro-3-hydroxy-2-(4- methoxyphenyl)-1,5-benzothiazepin-4(5H)-one [cis-(+)-5] in 80% overall yield.

Reactions of Methyl threo-2-Acetoxy-3-chloro-3-(4-methoxyphenyl)propanoate and Methyl cis-2,3-Epoxy-3-(4-methoxyphenyl)propanoate with 3,5-Dimethoxyphenol: Potential Routes to Flavan-3-ols

Brown, Roger. F. C.,Jackson, W. Roy,McCarthy, Tom D.,Fallon, Gary D.

, p. 1833 - 1843 (2007/10/02)

Attempted syntheses of flavan-3-ols by reaction of either methyl threo-2-acetoxy-3-chloro-3-(4-methoxyphenyl)propanoate (3) or methyl cis-2,3-epoxy-3-(4-methoxyphenyl)propanoate (14) with 3,5-dimethoxyphenol failed to give the required aryl ethers.Products usually were derived from C-alkylation of the electron-rich phenol although reaction of the chloro acetate (3) with the phenoxide ion gave the furanone (5).The single-crystal X-ray structures of methyl 4-hydroxy-3-(4-methoxyphenyl)-2-(4-methoxyphenylmethyl)-5-oxo-2,5-dihydrofuran-2-carboxylate and cis-3-hydroxy-5,7-dimethoxy-4-(4-methoxyphenyl)-3,4-dihydro-2H-1-benzopyran-2-one have been determined.

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