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187974-79-4

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187974-79-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 187974-79-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,9,7 and 4 respectively; the second part has 2 digits, 7 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 187974-79:
(8*1)+(7*8)+(6*7)+(5*9)+(4*7)+(3*4)+(2*7)+(1*9)=214
214 % 10 = 4
So 187974-79-4 is a valid CAS Registry Number.

187974-79-4Relevant articles and documents

'meso-Selective' functionalisation of N-benzyl-α-methylbenzylamine derivatives by α-lithiation and alkylation

Bragg, Ryan A,Clayden, Jonathan,Menet, Christel J

, p. 1955 - 1959 (2002)

Lithiation and methylation of amide and carbamate derivatives of α-methylbenzylamine proceeds with high diastereoselectivity in favour of meso bis-α-methylbenzylamine derivatives. Carboxylation of the intermediate organolithium is also diastereoselective, and with N-Boc p-methoxy-α-methylbenzylamine as starting material, oxidative cleavage provides a new asymmetric route to phenylglycine. Other electrophiles give a range of stereochemical outcomes, apparently depending on the stereospecificity of their reactions with a pair of diastereoisomeric organolithiums of low to moderate configurational stability.

Synthesis of Cyclic Guanidines Bearing N-Arylsulfonyl and N-Cyano Protecting Groups via Pd-Catalyzed Alkene Carboamination Reactions

Peterson, Luke J.,Luo, Jingyi,Wolfe, John P.

supporting information, p. 2817 - 2820 (2017/06/07)

Palladium-catalyzed carboamination reactions of N-allylguanidines bearing cleavable N-cyano or N-arylsulfonyl protecting groups are described. The reactions afford cyclic guanidine products in good yield, and transformations of substrates bearing internal alkenes proceed with high diastereoselectivity. Deuterium labeling studies indicate these transformations proceed via anti-aminopalladation pathways.

Pd(II)-catalyzed allylic C-H amination for the preparation of 1,2- and 1,3-cyclic ureas

Nishikawa, Yasuhiro,Kimura, Seikou,Kato, Yuri,Yamazaki, Natsuka,Hara, Osamu

supporting information, p. 888 - 891 (2015/03/18)

A general synthesis of 1,2- and 1,3-cyclic ureas is accomplished by intramolecular allylic C-H amination employing Pd(TFA)2/bis-sulfoxide as a catalyst. By careful modification of substrates and catalyst, a variety of 1,2-cyclic ureas are accessible from not previously employed terminal olefins substituted in allylic or vinylic positions. Furthermore, MS4A is found to be an effective additive for the synthesis of 1,3-cyclic ureas in good yields and excellent diastereoselectivities.

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