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201667-72-3

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201667-72-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 201667-72-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,1,6,6 and 7 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 201667-72:
(8*2)+(7*0)+(6*1)+(5*6)+(4*6)+(3*7)+(2*7)+(1*2)=113
113 % 10 = 3
So 201667-72-3 is a valid CAS Registry Number.

201667-72-3Relevant academic research and scientific papers

Synthesis of the spiroketal core of integramycin

Prusov, Evgeny V.

supporting information, p. 2446 - 2450 (2014/01/06)

A concise synthetic strategy towards the spiroketal core of the HIV-integrase inhibitor integramycin (1) was developed. The required ketone precursor was efficiently constructed from two simple and easily accessible subunits by means of a hydrozirconation/copper catalyzed acylation reaction. The effects of different protecting groups on the spiroketalization step were also investigated.

Synthesis of the C1-C9 fragment of the potent antitumor agent dictyostatin

Dias, Luiz C.,Sant'ana, Danilo P.,Vieira, Ygor W.,Gonc?alves, Caroline C.S.,Lima, Dimas J.P.

, p. 344 - 348 (2012/06/01)

We describe herein a short and efficient synthesis of the C1-C9 fragment of the potent antitumor agent dictyostatin. Notable features of this approach include a Sharpless asymmetric epoxidation followed by epoxide opening under Myashita's conditions to in

Stereodivergent approach to enantiopure hydroxyindolizidines through 1,3-dipolar cycloaddition of 3-hydroxypyrroline N-oxide derivatives

Cordero, Franca M.,Pisaneschi, Federica,Gensini, Martina,Goti, Andrea,Brandi, Alberto

, p. 1941 - 1951 (2007/10/03)

The (3S)-3-alkoxypyrroline N-oxides 7 and 27 were easily prepared from 1-malic acid and used as starting materials for enantiospecific syntheses of stereo differentiated polyhydro-xyindolizidines. Selection of the appropriate modality (inter or intramolec

Stereoselective approach to hydroxyindolizidines: Protection/deprotection of the nitrone functionality via cycloaddition/retrocycloaddition

Cordero, Franca M.,Gensini, Martina,Goti, Andrea,Brandi, Alberto

, p. 2475 - 2477 (2007/10/03)

(equation presented) The enantiomerically pure indolizidine (-)-21 has been synthesized starting from L-malic acid. The key intermediate 20 has been assembled through an intramolecular 1,3-dipolar cycloaddition of a nitrone generated in situ by retrocyclo

Application of the 2-azaallyl anion cycloaddition method to an enantioselective total synthesis of (+)-coccinine

Pearson, William H.,Lian, Brian W.

, p. 1724 - 1726 (2007/10/03)

A highly functionalized perhydroindole is formed by the intramolecular [π4s+π2s] cycloaddition of a 2-azaallyl anion with a vinyl sulfide [Eq. (a)]. This is the key step in the total synthesis of (+)-coccinine, the enantiomer of the Amaryllidaceae alkaloi

Synthetic studies on ciguatoxin [1]; construction of the spiro acetal part (C46-C55)

Oka, Takahiro,Murai, Akio

, p. 1 - 20 (2007/10/03)

The spiro acetal part (C46-C55) of ciguatoxin was synthesized stereoselectively.

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