A ruthenium-catalyzedswitchableN–H/C–Halkenylation reaction of 6-phenyl-(dihydro)pyridazin-3(2H)-ones triggered by a nitrogen/oxygen atmosphere was developed. To achieve switchable modification of the two important sites of the widely used pharmacophore, a simple and efficient procedure containing two optimized ruthenium catalytic systems was utilized, which afforded excellent activity, high selectivity
A Cu-catalyzed tandem dehydrogenation/dehalogenation sequential reaction along with N-arylation has been developed for the synthesis of pyridazinone derivatives in an aerobic and aqueous environment. To achieve the transformation of three chemical bonds in a one-pot reaction, a multifunctional copper catalyst was used which afforded excellent activity, high selectivity, and recyclability. The catalytic system consists of a water-soluble Cusalen complex and Na2CO3 in neat water and an air atmosphere.
ALBRIGHT J. D.; MCEVOY F. J.; MORAN D. B., J. HETEROCYCL. CHEM., 1978, 15, NO 6, 881-892
作者:ALBRIGHT J. D.、 MCEVOY F. J.、 MORAN D. B.
DOI:——
日期:——
US4112095A
申请人:——
公开号:US4112095A
公开(公告)日:1978-09-05
A Copper-Catalyzed Aerobic Cascade Dehydrogenative- Dehalogenative Reaction
A copper‐catalyzed cascade dehydrogenative and dehalogenativereaction of halogenated 6‐phenyl‐4,5‐dihydropyridazin‐3(2H)‐ones to 6‐phenylpyridazin‐3(2H)‐ones has been developed. Moreover, the catalytic system consisting of copper(II) acetate/sodium carbonate/pyridine exhibits high reactivity and selectivity with oxygen as the terminal oxidant.