Silver-catalysed hydroamination: synthesis of functionalised pyrroles
摘要:
It has been shown that functionalised pyrroles can be efficiently prepared using a two-step sequence. This sequence involves the propargylation of secondary enaminones using n-BuLi and propargyl bromide, followed by intramolecular hydroamination catalysed by silver nitrate. The hydroamination can be carried out at room temperature (overnight) or in a domestic microwave oven (60s). (C) 2004 Elsevier Ltd. All rights reserved.
A General and Efficient Method for the Preparation of β-Enamino Ketones and Esters Catalyzed by Indium Tribromide
作者:Zhan-Hui Zhang、Liang Yin、Yong-Mei Wang
DOI:10.1002/adsc.200505268
日期:2006.1
A variety of β-enaminoketones and esters have been synthesized in high to exellent yields by reacting β-dicarbonyl compounds with amines in the presence of a catalytic amount of indiumtribromide. The reaction proceeds smoothly at room temperature in a short reaction time under solvent-free conditions.
Iodine‐Catalyzed Conversion of β‐Dicarbonyl Compounds into β‐Enaminones Within a Minute Under Solvent‐Free Conditions
作者:Siddhartha Gogoi、Ranjana Bhuyan、Nabin C. Barua
DOI:10.1080/00397910500290557
日期:2005.11.1
Abstract Synthesis of β‐enaminones from β‐dicarbonyl compounds has been achieved in high yields within a minute using primary and aromatic amines and catalytic amounts of iodine undersolvent‐freeconditions at room temperature.
An Expeditious Synthetic Access to β-(<i>Z</i>)-[(1-Propynyl)amino]enones and β-[(<i>Z</i>)-(1-Propynyl)amino]enoates
作者:David Gravestock、Martin C. Dovey
DOI:10.1055/s-2003-37654
日期:——
The silver nitrate promoted reaction of propargyl bromide with (Z)-4-amino-3-penten-2-ones and (Z)-3-amino-2-butenoates provides rapid access to β-(Z)-[(1-propynyl)amino]enones and β-[(Z)-(1-propynyl)amino]enoates respectively.
An Easy Synthesis of Enaminones in Water as Solvent
作者:Hélio A. Stefani、Iguatemi M. Costa、Diogo de O. Silva
DOI:10.1055/s-2000-7608
日期:——
Enaminones were prepared from β-ketoesters or 1,3-diketones and primary amines in water als solvent.
烯丙酮是由δ-酮或 1,3-二酮和伯胺在水溶剂中制备而成。
Reaction of benzamide oxime with DCC
作者:Etsuko Kawashima、Katsumi Tabei
DOI:10.1002/jhet.5570230610
日期:1986.11
Reaction of benzamide oxime (1) with N, N′-dicyclohexylcarbodiimide (2) afforded 5-cyclohexylamino-3-phenyl-1,2,4-oxadiazole (3), N, N′, N″-tricyclohexylguanidine (4) and N, N′-dicyclohexyl urea (5). When acetone (8a) or ethyl acetoacetate (8b) was added as a trap, the yield of 3 increased slightly and N-(2-propylidene)cyclohexylamine (9a) or ethyl 3-cyclohexylamino-2-butenoate (9b) was obtained as
苯甲酰胺肟(1)与N,N'-二环己基碳二亚胺(2)反应,得到5-环己基氨基-3-苯基-1,2,4-恶二唑(3),N,N ',N '' -三环己基胍(4)和N,N′-二环己基脲(5)。当添加丙酮(8a)或乙酰乙酸乙酯(8b)作为捕集阱时,产率3略有提高,并获得N-(2-亚丙基)环己胺(9a)或3-环己基氨基-2-丁烯酸乙酯(9b),以及产品4和5。乙酰丙酮(8c)和二乙酰(8d)也用作环己基氨基的捕集剂。当添加对甲苯磺酸作为催化剂时,以低收率获得了1-环己基-5-环己基氨基-3-苯基-1 H -1,2,4-三唑(11)。