Synthesis of 3-Trifluoromethyl-1,4-dihydropyridazines by the PTSA-Catalyzed Reaction of α,β-Unsaturated Aldehydes with (E)-1-Phenyl-2-(2,2,2-trifluoroethylidene)
作者:Yongming Wu、Haibo Xie、Jiangtao Zhu、Zixian Chen、Shan Li
DOI:10.1055/s-0031-1290608
日期:2012.4
A facile and efficient method for the synthesis 3-trifluoromethyl-1,4-dihydropyridazine from a variety of readily available α,β-unsaturated aldehyde and (E)-1-phenyl-2-(2,2,2-trifluoroethylidene)hydrazine was developed. The reaction proceeded under mild conditions and gave the expected 1,4-dihydropyridazine products in moderate to high yields.
Fluorine effects in organocatalysis – asymmetric Brønsted acid assisted Lewis base catalysis for the synthesis of trifluoromethylated heterocycles exploiting the negative hyperconjugation of the CF<sub>3</sub>-group
作者:Chandra M. R. Volla、Arindam Das、Iuliana Atodiresei、Magnus Rueping
DOI:10.1039/c4cc03229b
日期:——
An efficient Bronsted acid assisted Lewis base catalysis protocol for the synthesis of enantiomerically pure trifluoromethylated dihydropyridazines starting from readily available hydrazones and alpha,beta-unsaturated aldehydes has been developed. The reaction exhibits high tolerance towards many functional groups and is applicable to various aliphatic, aromatic and hetero-aromatic alpha,beta-unsaturated
[EN] VIRAL POLYMERASE INHIBITORS<br/>[FR] INHIBITEURS DE POLYMERASE VIRALE
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2009018656A1
公开(公告)日:2009-02-12
Compound of Formula I: wherein, R2, R5 and R6 are defined herein, are useful as inhibitors of the hepatitis C virus NS5B polymerase
化合物的化学式I:其中,R2、R5和R6如本文所定义,可用作乙型肝炎病毒NS5B聚合酶的抑制剂。
Ion-pairing catalysis in the enantioselective addition of hydrazones to <i>N</i>-acyldihydropyrrole derivatives
作者:Nagore Zabaleta、Uxue Uria、Efraim Reyes、Luisa Carrillo、Jose L. Vicario
DOI:10.1039/c8cc05311a
日期:——
demonstrated that dihydropyrrole-based enamide derivatives can act as efficient precursors of chiral quaternary N-acyliminium salts under Brønsted acid catalysis that undergo reactions with hydrazones, the latter participating as masked nucleophilic carbonyl group equivalents. The optimized methodology provides a variety of enantiopure α-substituted proline derivatives in excellent yields, being even compatible