Optimized Procedures for One-Pot Conversion of Alkyl Bromides into Amines via the Staudinger Reaction
作者:Anna Koziara、Andrzej Zwierzak
DOI:10.1055/s-1992-26300
日期:——
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 non-aqueous medium is described.
Novel Organophosphorus Reagents for the Synthesis of Amines
作者:Andrzej Zwierzak、Krystyna Osowska-Pacewicka
DOI:10.1080/10426509608545217
日期:1996.1
Abstract: New organophosphorus equivalents of a2 type N-protected amine synthons are presented.
摘要:介绍了 a2 型 N 保护胺合成子的新有机磷等价物。
Two-Carbon Homologation of Grignard Reagents to Primary Amines
作者:Krystyna Osowska-Pacewicka、Andrzej Zwierzak
DOI:10.1055/s-1996-4213
日期:1996.3
A novel, convenient synthesis of N-(diethoxyphosphoryl)aziridine is described. Application of this compound as a synthetic equivalent of an a2 type synthon for aminoethylation of Grignard reagents is demonstrated.
The reactions between diethyl N-(t-butoxycarbonyl)phosphoramidate 1. diisopropyl azodicarboxylate (DIAD), triphenylphosphine (TPP) and primary or secondary alcohols lead to the corresponding diethyl N-alkyl-N-(t-butoxycarbonyl)phosphoramidates 2a-o. Deprotection of crude 2 by refluxing with p-toluenesulfonic acid monohydrate in ethanol affords ammonium tosylates 3a-o in moderate to good overall yields. The N-alkylation of 1 proceeds stereoselectively with complete inversion of the configuration of the alkyl group.
An Optimized Version of Gabriel-Type Nucleophilic Amination
作者:Andrzej Zwierzak
DOI:10.1080/00397910008086868
日期:2000.7
N-Alkylation of primary alkyl bromides with diethyl N-sodio-N-(t-butoxycarbonyl)phosphoramidate 1 carried out in boiling acetonitrile in the presence of 10mol% of tetrabutylammonium bromide as catalyst leads to the corresponding N-alkyl derivatives 2a-1. Deprotection of 2 by refluxing with p-toluenesulfonic acid in ethanol affords ammonium tosylates 3a-1 in reasonable yields.