31519-50-3Relevant articles and documents
Hydrogenolysis of 1-Aminopyrazoles: Synthesis of Primary and Secondary Alkylamines
Adembri, G.,Camparini, A.,Ponticelli, F.,Scotton, M.
, p. 321 - 326 (2007/10/02)
The tautomerizable N-aminopyrazolone 9, the O-methyl 1 and N-methyl derivatives 4 were condensed with carbonyl compounds to give the alkenylaminopyrazoles 12, 2a-g and 5c, wich, under mild conditions, were hydrogenated to the corresponding alkylamino derivatives.The subesquent hydrogenation of the latter ones gave different results according to the structure of the starting material.The 5-methoxy-1-alkylaminopyrazoles 3a-g yielded the 5-methoxypyrazole 15 and the corresponding primary amines in good yields.On the contrary, N-methyl-1-alkylaminopyrazolone-5 6c gave 1-a lkylpyrazolone-3 8.
Optimized procedures for one-pot conversion of alkyl bromides into amines via the Staudinger reaction
Koziara,Zwierzak
, p. 1063 - 1065 (2007/10/02)
New optimized procedures for transforming primary and secondary alkyl bromides into the corresponding primary amine salts have been elaborated. Essential modifications of azidation and deprotection of intermediate triethoxyphosphine alkylimides resulted in substantial improvement of the overall yields. Conversion of ammonium tosylates and hydrochlorides into free amines in a nonaqueous medium is described.
Conversion of Alcohols into Primary Amines, a New Mitsunobu Version of Gabriel-type Synthesis
Slusarska, Elzbieta,Zwierzak, Andrzej
, p. 402 - 405 (2007/10/02)
Primaere und sekundaere Alkohole liefern die entsprechenden Amin-hydrochloride 3 mit guten Ausbeuten (60-85percent), wenn sie unter milden Bedingungen mit N-(Diethoxyphosphoryl)-carbamidsaeure-tert-butylester (1) in Gegenwart von Azodicarbonsaeure-diethylester/Triphenylphosphan umgesetzt und danach die entstandenen N-Alkyl-N-(diethoxyphosphoryl)carbamidsaeureester 2 mit gasfoermigem HCl gespalten werden.Die Stereochemie dieser Reaktion wird untersucht.
Phosphoramides. XIII. Phosphorus Pentaoxide-Amine Hydrochloride Mixtures as Reagents in the Synthesis of 4(3H)-Quinazolinones and 4-Quinazolinamines
Nielsen, Knud Erik,Pedersen, Erik B.
, p. 637 - 642 (2007/10/02)
4(3H)-Quinazolinones 3a-r have been prepared by heating methyl N-acylanthranilates 1a-c and the hydrochlorides of primary aliphatic and aromatic amines with phosphorus pentaoxide and N,N-dimethylcyclohexylamine at 180 deg C. 4-Quinazolinamines 4 and the amidine 7 were isolated as by-products.The carboxamides 5 and 6 were believed to be reaction intermediates.By raising the temperature to 250 deg C 4 was obtained in a preparative yield.