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64889-55-0

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64889-55-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 64889-55-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,8,8 and 9 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 64889-55:
(7*6)+(6*4)+(5*8)+(4*8)+(3*9)+(2*5)+(1*5)=180
180 % 10 = 0
So 64889-55-0 is a valid CAS Registry Number.

64889-55-0Relevant articles and documents

Taking control of P1, P1′ and double bond stereochemistry in the synthesis of Phe-Phe (E)-alkene amide isostere dipeptidomimetics

Wiktelius, Daniel,Luthman, Kristina

, p. 603 - 605 (2007)

A protocol for the stereocontrolled independent preparation of Phe-Phe trans-vinyl amide isostere dipeptideomimetics was developed based on a Wittig-type reaction. In the reaction two chiral building blocks were joined with excellent E-selectivity to give

Asymmetric hydroformylation of Z -Enamides and enol esters with rhodium-bisdiazaphos catalysts

Abrams, M. Leigh,Foarta, Floriana,Landis, Clark R.

supporting information, p. 14583 - 14588 (2015/01/08)

Asymmetric hydroformylation (AHF) of Z-enamides and Z-enol esters provides chiral, alpha-functionalized aldehydes with high selectivity and atom economy. Rh-bisdiazaphospholane catalysts enable hydroformylation of these challenging disubstituted substrates under mild reaction conditions and low catalyst loadings. The synthesis of a protected analog of l-DOPA demonstrates the utility of AHF for enantioselective, atom-efficient synthesis of peptide precursors.

A facile one-pot synthesis of 2-fluoroalkyl 1,3-imidazolines and 1,3-oxazolines through imidoyl halide intermediates

Jiang, Haizhen,Sun, Lan,Yuan, Shijie,Lu, Wenjun,Wan, Wen,Zhu, Shizheng,Hao, Jian

supporting information; experimental part, p. 2858 - 2863 (2012/05/05)

A facile one-pot procedure has been developed for the synthesis of 1,3-imidazolines and 1,3-oxazolines bearing fluorinated alkyl groups at the 2-position. The reaction involves the condensation of N-monosubstituted ethane-1,2-diamines or 2-aminoethanols with a fluorinated carboxylic acid in the presence of PPh3/CX4. The proposed mechanism is that the amide intermediates were initially formed, and then converted to the imidoyl halide intermediates in the presence of PPh3/CX4, followed by rapid intramolecular cyclization to 1,3-diazoline products. This protocol allows for the synthesis of 2-bromodifluoromethyl-1,3-imidazoline, a useful CF2Br-heterocyclic building block, which can be used for the synthesis of gem-difluoromethylene linked compounds.

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