2033-89-8Relevant articles and documents
Thomas
, p. 430,431, 436 (1970)
Synthesis of a Fluorescent-Labeled Bisbenzamidine Containing the Central (6,7-Dimethoxy-4-coumaryl)Alanine Building Block
H?ussler, Daniela,Gütschow, Michael
, p. 367 - 373 (2015)
The synthesis of an amino acid amide is reported, which contains two benzamidine cores, one placed in the amide part the other one within the sulfonyl N-capping group. The amino acid side chain bears the 6,7-dimethoxycoumarin fluorophore. The fluorescent amino acid was prepared by using the von-Pechmann reaction. The two corresponding nitrile groups of a precursor molecule were simultaneously converted to the amidine moieties by the Pinner reaction. The fluorescent properties of the final compound were determined.
The graphite-catalyzed: ipso -functionalization of arylboronic acids in an aqueous medium: metal-free access to phenols, anilines, nitroarenes, and haloarenes
Badgoti, Ranveer Singh,Dandia, Anshu,Parewa, Vijay,Rathore, Kuldeep S.,Saini, Pratibha,Sharma, Ruchi
, p. 18040 - 18049 (2021/05/29)
An efficient, metal-free, and sustainable strategy has been described for the ipso-functionalization of phenylboronic acids using air as an oxidant in an aqueous medium. A range of carbon materials has been tested as carbocatalysts. To our surprise, graphite was found to be the best catalyst in terms of the turnover frequency. A broad range of valuable substituted aromatic compounds, i.e., phenols, anilines, nitroarenes, and haloarenes, has been prepared via the functionalization of the C-B bond into C-N, C-O, and many other C-X bonds. The vital role of the aromatic π-conjugation system of graphite in this protocol has been established and was observed via numerous analytic techniques. The heterogeneous nature of graphite facilitates the high recyclability of the carbocatalyst. This effective and easy system provides a multipurpose approach for the production of valuable substituted aromatic compounds without using any metals, ligands, bases, or harsh oxidants.
Development of a Cross-Conjugated Vinylogous [4+2] Anionic Annulation and Application to the Total Synthesis of Natural Antibiotic (±)-ABX
Huang, Jing-Kai,Shia, Kak-Shan
supporting information, p. 6540 - 6545 (2020/03/03)
The cross-conjugated vinylogous [4+2] anionic annulation has been newly developed, the cascade process of which has a high preference for regiochemical control and chemoselectivity, giving rise to exclusively Michael-type adducts in moderate to high yields (up to 94 %, 35 examples). By making use of this approach as a key operation, the first total synthesis of natural antibiotic ABX, in racemic form, has been successfully achieved in a concise 7-step sequence with an overall yield of about 20 %.