The synthesis and some reactions of N-hydroxycarbamates
作者:E. Boyland、R. Nery
DOI:10.1039/j39660000346
日期:——
chloroformate, gave N-hydroxy-N-phenylurethane. Hydroxylamine hydrochloride and ethyl chloroformate yielded a product which changed into hydroxyurethane. Alkyl N-hydroxycarbamates and hydroxyurea gave O-xanthydryl derivatives. The N-hydroxycarbamates with aqueous dipotassium tetracyanonickelate(II) formed dipotassium tricyanonitrosylnickelate(II). No evidence of a Lossen-type rearrangement during the acid
羟胺和氯甲酸烷基酯在碱性介质中反应,以形成ñ - , - NO -二- ,和NNO -三烷氧羰基羟胺,依次。N-甲基羟胺类似地得到N-和NO-二烷氧基羰基-N-甲基-羟胺,O-甲基羟胺产生N-和NN-二烷氧基羰基-O-甲基羟胺。N-苯基羟胺与1当量的氯甲酸乙酯反应,得到N-羟基-N-苯基氨基甲酸酯。盐酸羟胺和氯甲酸乙酯产生产物,其变为羟基氨基甲酸酯。N-羟基氨基甲酸酯烷基和羟基脲得到O-黄羟基衍生物。所述Ñ -hydroxycarbamates用含水四氰二钾(II)而形成二钾tricyanonitrosylnickelate(II)。在这些羟氨基衍生物的酸和碱水解过程中,没有证据表明发生了洛森型重排。讨论了可能的水解机理。
The oxidation of alkyl or benzyl N-hydroxycarbamate produced mainly the corresponding O-alkoxycarbonyl or O-benzoxycarbonyl N-hydroxycarbamates and small amounts of the corresponding trisubstituted hydroxylamines. The oxidation of sodium benzhydroxamate with iodine gave O-benzoyl benzhydroxamate; hydroxyurea and N-hydroxy-N′-phenylurea were similarly converted into N-carbamoyloxyurea and N-hydroxy-N′-phenyl-N-phenylcarbamoylurea, respectively. Oxidation of ethyl, n-propyl, and benzyl N-hydroxycarbamates or hydroxyurea of N-hydroxy-N-phenylurea with iodine in aqueous ammonium carbonate gave the corresponding carbamates, urea, or phenylurea. With silver oxide in ether, alkyl N-hydroxycarbamates and their O-alkoxycarbonyl derivatives yielded N-silver-N-alkoxycarbonyloxycarbamates; simulataneous oxidation of ethyl and benzyl N-hydroxycarbamates gave NO-di- and NNO-tri-substituted hydroxylamines in which the substituents were ethoxycarbonyl, benzyloxycarbonyl, or, possibly, ethyl and benzyl groups.
α-Nitrosostyrenes as Three-Atom Units for the (3+1) Cyclization Reaction: Facile Access to 2,3-Dihydrodiazete <i>N</i>-Oxides and Their Diversified Synthetic Conversions
structurally unique and hitherto unexplored 2,3-dihydrodiazete N-oxides in moderate to high yields. The products possess a highly strained four-membered ring structure containing two nitrogen atoms. The synthetic applicability of the products was also demonstrated by many important conversions to diverse nitrogen-containing compounds.