摘要:
A process is provided for preparing 4-hydroxy-3-nitrobiphenyl from 4-hydroxy-biphenyl by nitrating in the position adjacent to the phenolic hydroxyl group in high selectivity and yield, and the nitric acid used as the nitrating reagent is metered into the reaction system in a specific manner.
摘要:
2-Alkyl-3-aryl- or -heteroaryloxaziridines are prepared in a particularly advantageous manner by oxidizing corresponding N-alkyl-aryl- or -heteroarylaldimines with an aromatic percarboxylic acid or a salt thereof in the presence of water, a water-soluble base, and a water-miscible solvent, at temperatures below 30° C. Using this method, it is also possible to obtain novel 2-alkyl-3-aryloxaziridines.
摘要:
2-Alkyl-3-aryl- or -heteroaryloxaziridines are prepared in a particularly advantageous manner by oxidizing corresponding N-alkyl-aryl- or -heteroarylaldimines with an aromatic percarboxylic acid or a salt thereof in the presence of water, a water-soluble base, and a water-miscible solvent, at temperatures below 30° C. Using this method, it is also possible to obtain novel 2-alkyl-3-aryloxaziridines.
摘要:
The invention relates to a novel process for preparing 2-phenoxyacetals and the corresponding 2-phenoxycarbaldehydes. These compounds are important intermediates for the preparation of active pharmaceutical ingredients.
摘要:
A process is provided for preparing optionally substituted arylated benzylamines from the corresponding optionally substituted aryl halides and optionally substituted benzylamines using a specific solvent mixture, a base and a catalyst comprising a palladium compound and a bisaryldialkylphosphine.
摘要:
Polyhalogenated cinnamic acids and cinnamic acid derivatives are prepared by reacting diazonium salts accessible from polyhalogenated anilines with acrylic acid or acrylic acid derivatives in the presence of a homogeneous, palladium-containing catalyst at about −5 to about +100° C. Some of the cinnamic acids and cinnamic acid derivatives obtainable in this way are new. Cinnamic acids and cinnamic acid derivatives which can be prepared according to the invention can be used for the preparation of indanones which are precursors for agro- and pharmaceutical chemicals and for substances having liquid-crystalline properties.
摘要:
This invention relates to a process for preparing N-substituted hydroxylamines from N-substituted aryl- or heteroaryloxaziridines by acid hydrolysis and isolation of the N-substituted hydroxylamines in the form of their salts.
摘要:
The present invention relates to a simplified process for preparing pyrazolylcarboxanilides by reacting pyrazolylcarboxylic esters with anilines in the presence of a base and removing at least one reaction product.
摘要:
The present invention relates to a process for preparing substituted biphenylanilides of the formula I wherein R1 is a protected amino group which comprises reacting a compound of formula II in the presence of a base and of a palladium catalyst in a solvent, with an organoboron compound of formula (III)
摘要:
The present invention relates to a process for preparing 2-fluoroacyl-3-aminoacrylic acid derivatives by reacting fluorinated carboxylic acids with dialkylaminoacrylic acid derivatives and acid halides.