A Remarkable Reductive Dearomatization of Thiophene and Furan Rings
摘要:
Reduction of a 2-nitrothiophene 4 and the corresponding 2-nitrofuran 20 with zinc and acetic acid produced a remarkable dearomatization and fragmentation reaction to give acyclic nitriles 6 and 22, respectively. The intermediate 2-aminothiophene 5 was trapped by acylation with acetic anhydride to give acetamide 7. An additional acrylonitrile intermediate 17 was also trapped by Michael addition with benzyl mercaptan to give adduct 18. An alternate synthesis of nitrile 22 produced in the reduction of nitrofuran 20 provided an authentic sample of the product. The conversion of nitroaromatic heterocycles 4 and 20 into aliphatic nitriles 6 and 22 are remarkable and unprecedented reactions.
A Visible Light Driven Nickel Carbonylation Catalyst: The Synthesis of Acid Chlorides from Alkyl Halides
作者:Kristian El Chami、Yi Liu、Mohammed A. Belahouane、Yiyang Ma、Pierre‐Louis Lagueux‐Tremblay、Bruce A. Arndtsen
DOI:10.1002/anie.202213297
日期:2023.3
A visible light driven nickel carbonylation catalyst has been develop. This offers a method for carbonylative coupling reactions with an earth abundant metal at ambient temperature for the conversion of alkyl halides into synthetically versatile acid chlorides. The acid chlorides can then be transformed into an array of challenging ester, thioester and amide products.
A Remarkable Reductive Dearomatization of Thiophene and Furan Rings
作者:Norton Peet、Son Nguyen、Xiaoyuan Ding
DOI:10.1055/s-0033-1338416
日期:——
Reduction of a 2-nitrothiophene 4 and the corresponding 2-nitrofuran 20 with zinc and acetic acid produced a remarkable dearomatization and fragmentation reaction to give acyclic nitriles 6 and 22, respectively. The intermediate 2-aminothiophene 5 was trapped by acylation with acetic anhydride to give acetamide 7. An additional acrylonitrile intermediate 17 was also trapped by Michael addition with benzyl mercaptan to give adduct 18. An alternate synthesis of nitrile 22 produced in the reduction of nitrofuran 20 provided an authentic sample of the product. The conversion of nitroaromatic heterocycles 4 and 20 into aliphatic nitriles 6 and 22 are remarkable and unprecedented reactions.