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20143-53-7

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20143-53-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20143-53-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,1,4 and 3 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 20143-53:
(7*2)+(6*0)+(5*1)+(4*4)+(3*3)+(2*5)+(1*3)=57
57 % 10 = 7
So 20143-53-7 is a valid CAS Registry Number.

20143-53-7Relevant articles and documents

Nickel-Catalyzed Intramolecular Nucleophilic Addition of Aryl Halides to Aryl Ketones for the Synthesis of Benzofuran Derivatives

Zhu, Xiao-Rui,Deng, Chen-Liang

supporting information, p. 1842 - 1848 (2021/02/09)

A nickel-catalyzed intramolecular nucleophilic addition reaction of aryl halides to aryl ketones for the formation of benzofuran derivatives has been developed. A number of substrates bearing electron-donating or electron-withdrawing groups were subjected to the standard reaction conditions, giving the corresponding products in moderate to good yields.

Total synthesis of protosappanin A and its derivatives via palladium catalyzed ortho C-H activation/C-C cyclization under microwave irradiation

Liu, Jiaqi,Zhou, Xuan,Wang, Chenglong,Fu, Wanyong,Chu, Wenyi,Sun, Zhizhong

, p. 5152 - 5155 (2016/05/02)

A total synthesis method for protosappanin A, which is a complex natural product with many biological activities, was developed with 6 linear steps. Dibenzo[b,d]oxepinones as the key intermediates of the synthetic route were prepared by a palladium-catalyzed ortho C-H activation/C-C cyclization under microwave irradiation. 25 derivatives of protosappanin A were obtained.

Palladium(0)-catalyzed single and double isonitrile insertion: A facile synthesis of benzofurans, indoles, and isatins

Senadi, Gopal Chandru,Hu, Wan-Ping,Boominathan, Siva Senthil Kumar,Wang, Jeh-Jeng

supporting information, p. 998 - 1003 (2015/02/05)

A palladium(0)-catalyzed cascade process consisting of isonitrile insertion and ?±-Csp3-H cross-coupling can be achieved for the synthesis of benzofurans and indoles. The construction of isatins by a Pd-catalyzed cascade reaction incorporating double isonitrile insertion, amination, and hydrolysis has also been achieved. The key features of this work include diverse heterocycle synthesis, phosphine-ligand-free reaction conditions, a one-pot procedure, simple and commercially available starting materials, broad functional-group compatibility, and moderate to good reaction yields.

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