We have developed a one-pot method for the direct intermolecular reductive hydroxyalkylation or alkylation of amines using lactones or esters as the hydroxyalkylating/alkylating reagents. The method is based on the in situ amidation of lactones/esters with DIBAL-H–amine complex (for primary amines) or DIBAL-H–amine hydrochloride salt complex (for secondary amines), followed by reduction of the amides
Tandem Polar/Radical Crossover Sequences for the Formation of Fused and Bridged Bicyclic Nitrogen Heterocycles Involving Radical Ionic Chain Reactions, and Alkene Radical Cation Intermediates, Performed under Reducing Conditions: Scope and Limitations
anion contact ion pairs which are trappedintramolecularly in a tandem polar/radical crossover sequence involving radical ionic chain reactions by allylic and propargylic amines. The substitution pattern of the alkene radical cation dictates the cyclization mode, and this may be engineered to form fused ring systems by an initial exo-mode nucleophilic cyclization or bridged bicyclic systems when the nucleophilic
LiNTf2 in the reaction of lactones with amines is able to activate cyclic esters towards ring opening, thus leading to clean open-chain amides under mild conditions and using a stoichiometric amount of amine. The generality of the method was demonstrated by a range of selected lactones and amines.
[EN] PROCESS FOR THE PREPARATION OF N-AKYL-PYRROLIDONES<br/>[FR] PROCEDE DE PREPARATION DE N-ALKYLPYRROLIDONES
申请人:DAVY PROCESS TECHN LTD
公开号:WO2005121083A1
公开(公告)日:2005-12-22
A process for the production of N-alkylpyrrolidone from Ϝ-butyrolactone and monoalkylamine in the liquid phase comprising the steps of: feeding monoalkylamine and Ϝ-butyrolactone, in the absence of water or in the presence of less than about 1 wt % of water, to a reaction zone to form a reaction mixture; heating the reaction mixture; withdrawing a product stream from the reaction zone and passing the stream to a distillation zone comprising at least one distillation column operated at sub-atmospheric pressure; adding water to the distillation zone; isolating at least one overhead stream from the distillation zone comprising monoalkylamine, water and optionally N-alkyl-pyrrolidone and condensing the overhead stream against cooling water.