3-Hydroxyhydantoine: Eine neue Klasse cyclisch diacylierter Hydroxylamine

3-Hydroxyhydantoins, representing a new class of compounds, are easily accessible from esters of α-isocyanato fatty acids and hydroxylamine via esters of α-hydroxyureido fatty acids. Structural assignment is based on Exner correlations of infrared spectra and other physical data. Chemical properties are as expected from those of hydantoins.     

Eine neue Synthese von Muscon und Exalton®. Die Enamin-Route der Ringerweiterungsreaktion

A New Synthesis of Muscone and Exaltone®. The Enamine Approach of Ring-Enlargement Reaction Key reaction in the synthesis of the title compounds is the treatment of the aldehydes 6 and 7 (obtained from 1 ) with a primary amine, e.g. pentylamine, in EtOH at room temperature. After stirring overnight, the products 8 and 9 , respectively, are obtained in good yields. Both are enlargement by three ring members and can be transformed to Exalton® ( 12 ) and (±)-muscone, ( 13 ), respectively.     

Eine neue Methode zur Synthese von Polymeren, die Amid- und Imid-Gruppen in der Hauptkette enthlaten

Ohne Zusammenfassung     

Eine neue Synthese von DL-Armentomycin und verwandten 2-Amino-4-polyhalobuttersäuren

A New Synthesis of DL -Armentomycin and Related 2-Amino-4-polyhalobutyric Acids An efficient method for the synthesis of 2-amino-4-halobutyric acids 2 starting from the corresponding ethyl 2,4-polyhalobutyrates 1 is presented (s. Scheme 1). The method is illustrated by a high yield synthesis of the known antibiotic DL -armentomycin (= 2-amino-4,4-dichlorobutyric acid; 2a ).