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220037-58-1

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220037-58-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 220037-58-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,0,0,3 and 7 respectively; the second part has 2 digits, 5 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 220037-58:
(8*2)+(7*2)+(6*0)+(5*0)+(4*3)+(3*7)+(2*5)+(1*8)=81
81 % 10 = 1
So 220037-58-1 is a valid CAS Registry Number.

220037-58-1Relevant articles and documents

Chiral Lewis Base-Catalyzed, Enantioselective Reduction of Unprotected β-Enamino Esters with Trichlorosilane

Ye, Jianheng,Wang, Chao,Chen, Lin,Wu, Xinjun,Zhou, Li,Sun, Jian

supporting information, p. 1042 - 1047 (2016/04/19)

Catalytic asymmetric reduction of N-unsubstituted β-enamino esters represents a major challenge for asymmetric catalysis. In this paper, the first organocatalytic system that could be used for the asymmetric hydrosilylation of N-unsubstituted β-enamino esters has been developed. Using N-tert-butylsulfinyl-L-proline-derived amides and L-pipecolinic acid-derived formamides as catalyst, a broad range of β-aryl- and β-alkyl-substituted free β-amino esters could be prepared with high yields and enantioselectivities. The practicality was illustrated by the gram-scale asymmetric synthesis of ethyl (R)-3-amino-3-phenylpropanoate and isopropyl (S)-3-amino-4-(2,3,5-trifluorophenyl)butanoate. The resulting product can be smoothly transformed to the FDA approved medicines dapoxetine and sitagliptin in a short synthetic route.

A highly enantioselective organocatalytic method for reduction of aromatic N-alkyl ketimines

Wang, Chao,Wu, Xinjun,Zhou, Li,Sun, Jian

supporting information; experimental part, p. 8789 - 8792 (2009/09/25)

A study has demonstrated the development of a highly enantioselective catalytic method for the reduction of aromatic N-alkyl ketimines by trichlorosilane under mild conditions using the newly designed Lewis base organocatalyst that incorporates C- and S-chirality. The S-chiral sulfinamide group in these catalysts plays a crucial role similar to the carboxamide groups as Lewis base for the activation of HSiCl3, and also serves as a source of chirality that the carboxamide group lacks for the asymmetric induction. The results of the study showed that excellent enantioselectivities of up to 99.6% ee and high yields were obtained for a wide range of substrates. Further works is also in progress to clarify the mechanism of the transformation and explore the full application scope of the present catalyst system.

On-bead combinatorial approach to the design of chiral stationary phases for HPLC

Murer, Peter,Lewandowski, Kevin,Svec, Frantisek,Frechet, Jean M. J.

, p. 1278 - 1284 (2007/10/03)

A library of 36 L-amino acid anilides, which are potential selectors for chiral HPLC, was synthesized in solution and attached to functionalized macroporous polymer beads. The best selector from the library was identified by a deconvolution process using

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