I
<sub>2</sub>
‐Promoted [3+2] Cyclization of 1,3‐Diketones with Potassium Thiocyanate: a Route to Thiazol‐2(3
<i>H</i>
)‐One Derivatives
作者:Zhenyu An、Yafeng Liu、Pengbo Zhao、Rulong Yan
DOI:10.1002/adsc.202100228
日期:2021.7
An I2-promoted strategy has been developed for the synthesis of thiazol-2(3H)-onederivatives from 1,3-diketones with potassium thiocyanate. This [3+2] cyclization reaction involves C−S and C−N bond formation and exhibits good functional group tolerance. A series of thiazol-2(3H)-onederivatives are obtained in moderate to good yields.
已开发出一种 I 2促进策略,用于从 1,3-二酮与硫氰酸钾合成 thiazol-2(3 H )-one 衍生物。这种 [3+2] 环化反应涉及 C-S 和 CN 键的形成,并表现出良好的官能团耐受性。以中等至良好的产率获得了一系列 thiazol-2(3 H )-one 衍生物。
[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.
β-unsaturated acyl azolium species was efficiently trapped by 1,3-dicarbonyl compounds via a Michael addition/spiroannualtion cascade, delivering a series of synthetically important spirooxindole δ-lactones with up to 96% enantioselectivity.
Compounds belonging to the 5-acyl-3,4-dihydropyrimidine-2-thione family were obtained using a solvent-free Biginelli condensation with or without the use of a catalyst. An unprecedented solid-phase procedure involving a polymer-supported aldehyde allowed the preparation of a series of 5-aroyl derivatives starting with crude diketones obtained from their corresponding aryl esters.
[EN] PYRIDAZIN-3(2H)-ONE DERIVATIVES AS PDE4 INHIBITORS<br/>[FR] DERIVES DE LA PYRIDAZINE-3(2h)-ONE, INHIBITEURS DE LA PDE4
申请人:ALMIRALL PRODESFARMA SA
公开号:WO2003097613A1
公开(公告)日:2003-11-27
New pyridazin-3(2H)-one derivatives having the chemical structure of general formula (I); are disclosed; as well as processes for their preparation, pharmaceutical compositions comprising them and their use in therapy as inhibitors of phosphodiesterase 4.