Transition Metal-Free De Novo Synthesis of Sulfonated Pyrazoles from Sulfonyl Hydrazides, 1,3-Diketones, and Sodium Sulfinates at Room Temperature
作者:Jiawen Chen、Dongwei Chen、Jinqiang Kuang、Yongmin Ma
DOI:10.1021/acs.joc.1c00171
日期:2021.7.16
A transition metal-free method for de novo construction of diverse sulfonated pyrazoles from readily available sulfonyl hydrazides, 1,3-diketones, and sodiumsulfinates was established under mild conditions. Pyrazoles bearing two different sulfonyl groups were obtained in one step. The method features a diversity of substituents of the pyrazole products and a remarkably simple work-up.
We report the catalytic oxidative cleavage of 1,3-diketones to the corresponding carboxylic acids by aerobic photooxidation with iodine under irradiation with a high-pressure mercury lamp. photooxidation - aerobic - iodine - 1,3-diketone - carboxylic acid
[EN] NEW PYRIDAZIN-3(2H)-ONE DERIVATIVES<br/>[FR] NOUVEAUX DERIVES DE PYRIDAZIN-3(2H)-ONE
申请人:ALMIRALL PRODESFARMA SA
公开号:WO2004058729A1
公开(公告)日:2004-07-15
Pyridazin-3(2H)-one derivatives of formula (I) are found to inhibit PDE-4:, wherein R1, R2 and R4 are organic radicals, R3 is a cyclic group, and R5 is an ester or an aryl or heteroaryl group.
A concise and efficient method for the synthesis of alkynyl/benzoyl-functionalized quinolines through TfOH-promoted cascade 1,4-conjugate addition/intramolecular annulation/aromatization process is established.