A convergent synthesis of 1,3,4-oxadiazoles from acyl hydrazides under semiaqueous conditions
作者:Kazuyuki Tokumaru、Jeffrey N. Johnston
DOI:10.1039/c7sc00195a
日期:——
aromatic heterocycle valued for its low-lipophilicity in drug development. Substituents at the 2- and/or 5-positions can modulate the heterocycle's electronic and hydrogen bond-accepting capability, while exploiting its use as a carbonyl bioisostere. A new approach to 1,3,4-oxadiazoles is described wherein α-bromo nitroalkanes are coupled to acyl hydrazides to deliver the 2,5-disubstituted oxadiazole directly
Sulfated tungstate: an efficient catalyst for the Ritter reaction
作者:Kamlesh V. Katkar、Pramod S. Chaudhari、Krishnacharya G. Akamanchi
DOI:10.1039/c0gc00759e
日期:——
The use of sulfated tungstate as an efficient and reusable catalyst for the preparation of amides from alcohols and nitrilesvia the Ritter reaction pathway is discussed. The reaction proceeds under solvent free conditions.