A New Strategy for the Synthesis of Bis(alkadiynyl)amines and Azacycloalkadiynes Using Copper-Containing Catalysts
摘要:
An efficient method for the preparation of N-alkyl-N,N-di(alkadiynyl)amines and 1-alkyl-1-azacycloalkadiynes is developed via the aminomethylation reaction of ,-diacetylenes with N-alkyl-N,N-bis(ethoxymethyl)amines in the presence of copper halides as the catalysts.
A double Mannich approach to the synthesis of substituted piperidones—application to the synthesis of substituted E-ring analogues of methyllycaconitine
作者:Yinman Chan、Jared Balle、J. Kevin Sparrow、Peter D.W. Boyd、Margaret A. Brimble、David Barker
DOI:10.1016/j.tet.2010.06.084
日期:2010.8
The double Mannich reaction of acyclic α,γ-substituted β-keto esters and bis(aminol) ethers gives substituted 3,5-substituted-4-piperidones with high levels of diastereoselectivity. These piperdiones can be easily transformed into substituted E-ring analogues of the delphinium alkaloid methyllycacotine.
Efficient Synthesis of the Azabicyclo[3.3.1]nonane Ring System in the Alkaloid Methyllycaconitine Using Bis(alkoxymethyl)alkylamines as Aminoalkylating Agents in a Double Mannich Reaction
作者:Margaret A. Brimble、Constanze Brocke
DOI:10.1002/ejoc.200500003
日期:2005.6
The doubleMannichreaction of cyclic β-keto esters with bis(alkoxymethyl)alkylamines provides an efficient and versatile method for the construction of azabicyclo[3.3.1]nonanes and azabicyclo[3.2.1]octanes. The optimum conditions for efficientreaction involve use of the activator trichloromethylsilane in acetonitrile as solvent at ambient temperature. The utility of this synthetic method is further
Application of a Double Mannich Reaction Using<i>Bis</i>(aminol) Ethers in the Synthesis of AE Ring Analogues of Methyl Lycaconitine
作者:Margaret A. Brimble、Constanze Brocke、Diana S.-H. Lin、Malcolm D. McLeod
DOI:10.1055/s-2004-831340
日期:——
An efficient method for the construction of azabicyclo[3.3. 1]nonanes and azabicyclo[3.2. 1]octanes is reported via double Mannich reaction of cyclic ketoesters with bis(aminol) ethers. This method is applied to the synthesis of AE ring analogues of methyl lycaconitine.
The use of bis(aminol) ethers derived from aliphatic primary amines in the synthesis of secondary and tertiary amines
作者:Harry Heaney、George Papageorgiou
DOI:10.1016/0040-4020(96)00026-9
日期:1996.3
prepared from primary aliphatic amines and benzylamine together with formaldehyde and either ethanol or methanol; they were reacted with electrophiles to give N-alkyl-N-alkoxymethyl-methyleneiminium salts which gave mixtures of secondary and tertiaryamines in reactions with electron rich aromatic compounds: sequential reactions with two different nucleophiles gave the expected tertiaryamines.
A simple and efficient synthesis of polysubstituted 4-piperidones was achieved from the double Mannichreaction of β-keto esters and bisaminol ethers. The reaction is highly diastereoselective, as is the subsequent hydride reduction, to give polysubstituted 4-piperidols.