Compounds of the formula (I):
and pharmaceutically acceptable salts thereof, wherein
R1 is isopropyl or tertiary-butyl;
R2 is hydrogen, C1-4alkyl, C1-4alkoxy, hydroxy or amino; and
R3 is hydrogen or methyl; are described for use as β-adrenoceptor antagonists. Pharmaceutical compositions containing them are disclosed as are processes for their preparation and intermediates therefor.
A new mild synthetic route to N-arylated pyridazinones from aryldiazonium salts
作者:Ouissam El Bakouri、Daniel Cassú、Miquel Solà、Teodor Parella、Anna Pla-Quintana、Anna Roglans
DOI:10.1039/c4cc03190c
日期:——
An efficient method for the synthesis of N-arylated pyridazinones from potassium 2-furantrifluoroborate and aryldiazonium salts is described. The reaction was run in water at 0-5 degrees C in short reaction times and without any catalyst or additive. A mechanistic proposal is made based on the experimental data and DFT calculations.