2-Fluoro-1,3-diketones react with phenylhydrazine to yield ring-fluorinated pyrazoles in high yield. An isoxazole is produced when 2-fluoro-1,3-diphenyl-1,3-propandione is treated with hydroxylamine hydrochloride.
N-Fluoropyridinium salts provide a new system of fluorinatingagents by which a wide range of nucleophilic substrates differing in reactivity can be fluorinated due to the varying degree of fluorinating power and also fluorinated very selectively through structural alteration. The scope of selective fluorination should be broadened considerably on the basis of the present results. The N-fluoropyridinium
Nitrogen-containing heterocyclic compounds represented by the following Formula (1) are provided. The compounds or salts thereof have a strong EP1 antagonistic activity when they are administered to a human or an animal, and they are useful as an effective component of a pharmaceutical agent for prophylaxis and/or treatment of an overactive bladder, for example. Furthermore, they are useful as an effective component of a pharmaceutical agent for the prophylaxis and/or treatment of symptoms including frequent urination, urinary urgency and urinary incontinence.
2,2-Difluoro-1,3-diketones as <i>gem</i>
-Difluoroenolate Precusors for Asymmetric Aldol Addition with <i>N</i>
-Benzylisatins
作者:Jinlong Qian、Wenbin Yi、Xin Huang、Jerry P. Jasinski、Wei Zhang
DOI:10.1002/adsc.201600392
日期:2016.9.1
2,2‐Difluoro‐1,3‐diketones are introduced as gem‐difluoroenolate precursors for the first example of an organocatalytic asymmetric aldol addition with N‐benzylisatins to form 3‐difluoroalkyl‐3‐hydroxyoxindoles.
One-Pot Reactions for Modular Synthesis of Polysubstituted and Fused Pyridines
作者:Zhidong Song、Xin Huang、Wenbin Yi、Wei Zhang
DOI:10.1021/acs.orglett.6b02883
日期:2016.11.4
3-dicarbonyl-initiated one-pot Michael addition/[5 + 1] annulation/dehydrofluorinative aromatization reaction sequence is introduced for regioselectivesynthesis of di-, tri-, tetra-, and pentasubstituted pyridines as well as fusedpyridines. This simple and modular synthesis is performed using readily available starting materials and under transition-metal catalyst-free conditions.
Controlling reactivity through liquid assisted grinding: the curious case of mechanochemical fluorination
作者:Joseph L. Howard、Yerbol Sagatov、Laura Repusseau、Christiane Schotten、Duncan L. Browne
DOI:10.1039/c6gc03139k
日期:——
mechanochemically milled organicreaction where liquid-assisted grinding controls the selectivity, such a phenomenon has not been reported/observed before. It was found that upon milling dibenzoylmethane with Selectfluor in the absence of any solvent, a 3:1 ratio of monofluorinated:difluorinated product was observed. Whereas, addition of 0.125 mL of acetonitrile (∼10% of the total volume of materials present)