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23159-87-7

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23159-87-7 Usage

Synthesis Reference(s)

The Journal of Organic Chemistry, 42, p. 835, 1977 DOI: 10.1021/jo00425a014

Check Digit Verification of cas no

The CAS Registry Mumber 23159-87-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,1,5 and 9 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 23159-87:
(7*2)+(6*3)+(5*1)+(4*5)+(3*9)+(2*8)+(1*7)=107
107 % 10 = 7
So 23159-87-7 is a valid CAS Registry Number.

23159-87-7Relevant articles and documents

Improved Synthesis of MediPhos Ligands and Their Use in the Pd-Catalyzed Enantioselective N-Allylation of Glycine Esters

Albat, Dominik,Neud?rfl, J?rg-Martin,Reiher, Martin,Schmalz, Hans-Günther

supporting information, p. 4237 - 4242 (2021/08/24)

A new class of chiral C2-symmetric diphosphines (MediPhos) was recently shown to give superior results in the Pd-catalyzed asymmetric N-allylation of amino acid esters. We here describe a new, improved protocol for the preparation of such ligands through bidirectional SN2-coupling of a tartrate-derived ditosylate with 6-alkyl-2-bromophenols followed by double lithiation/phosphanylation. This method gave access to a series of nine ligands with branched alkyl substituents, which were benchmarked in the enantioselective Pd-catalyzed N-allylation of tert-butyl glycinate with racemic (E)-2,8-dimethylnona-5-en-4-yl methyl carbonate (up to 95 % ee). In addition, the analogous transformation of tert-butyl glycinate with methyl (E)-nona-5-en-4-yl carbonate was optimized. The obtained allylic amines were then used in the stereoselective synthesis of the conformationally restricted proline-derived dipeptide analogs ProM-17 and ProM-21.

Chiral Phosphine–Phosphite Ligands in Asymmetric Gold Catalysis: Highly Enantioselective Synthesis of Furo[3,4-d]-Tetrahydropyridazine Derivatives through [3+3]-Cycloaddition

Du, Qingwei,Neud?rfl, J?rg-Martin,Schmalz, Hans-Günther

supporting information, p. 2379 - 2383 (2018/01/27)

The AuI-catalyzed reaction of 2-(1-alkynyl)-2-alken-1-ones with azomethine imines regio- and diastereoselectively affords furo[3,4-d]tetrahydropyridazines in a tandem cyclization/intermolecular [3+3]-cycloaddition process under mild conditions.

Substrate-Based fragment identification for the development of selective, nonpeptidic inhibitors of striatal-enriched protein tyrosine phosphatase

Baguley, Tyler D.,Xu, Hai-Chao,Chatterjee, Manavi,Nairn, Angus C.,Lombroso, Paul J.,Ellman, Jonathan A.

, p. 7636 - 7650 (2013/11/06)

High levels of striatal-enriched protein tyrosine phosphatase (STEP) activity are observed in a number of neuropsychiatric disorders such as Alzheimer's disease. Overexpression of STEP results in the dephosphorylation and inactivation of many key neuronal

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