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142670-87-9

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142670-87-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 142670-87-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,6,7 and 0 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 142670-87:
(8*1)+(7*4)+(6*2)+(5*6)+(4*7)+(3*0)+(2*8)+(1*7)=129
129 % 10 = 9
So 142670-87-9 is a valid CAS Registry Number.

142670-87-9Relevant articles and documents

Study of a new rate increasing "base effect" in the palladium-catalyzed amination of aryl iodides

Meyers, Caroline,Maes, Bert U. W.,Loones, Kristof T. J.,Bal, Gunther,Lemiere, Guy L. F.,Dommisse, Roger A.

, p. 6010 - 6017 (2004)

Evidence for an interphase deprotonation of Pd(II)-amine complexes with weak carbonate base has been gained for the first time. When a rate-limiting deprotonation step is involved in the catalytic cycle, controlling the structure (shape and size of the particles) and/or molar excess of the carbonate base used can significantly increase the reaction rate of Buchwald-Hartwig aminations. By taking such a "base effect" into account a general protocol for the intermolecular amination of aryl iodides with all types of amines has been developed based on a standard Pd-BINAP catalyst, using cesium carbonate as the base.

Ligand-free Iron(II)-Catalyzed N-Alkylation of Hindered Secondary Arylamines with Non-activated Secondary and Primary Alcohols via a Carbocationic Pathway

Nayal, Onkar S.,Thakur, Maheshwar S.,Kumar, Manoranjan,Kumar, Neeraj,Maurya, Sushil K.

supporting information, p. 730 - 737 (2017/12/26)

Secondary benzylic alcohols represent a challenging class of substrates for N-alkylation of amines. Herein, we describe an iron(II)-catalyzed eco-friendly protocol for N-alkylation of secondary arylamines with secondary benzyl alcohols through a carbocationic pathway instead of the known borrowing hydrogen transfer (BHT) approach. Transiently generated carbocations, produced from alcohols via self-condensation, were coupled with arylamines to provide highly functionalized amine products. The scope of this methodology involves N-alkylation of primary, secondary and heterocyclic amines with primary/secondary benzylic, allylic and heterocyclic alcohols, which are common key structures in numerous pharmaceuticals drugs. The method can also be easily adopted for the amination of various natural products. (Figure presented.).

Synthesis of imidazo[4,5-b]pyridines and imidazo[4,5-b]pyrazines by palladium catalyzed amidation of 2-chloro-3-amino-heterocycles

Rosenberg, Adam J.,Zhao, Jinbo,Clark, Daniel A.

, p. 1764 - 1767 (2012/05/20)

A facile synthesis of imidazo[4,5-b]pyridines and-pyrazines is described using a Pd-catalyzed amide coupling reaction. This reaction provides quick access to products with substitution at N1 and C2. A model system relevant to the natural product pentosidi

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