Synthesis of 4-Substituted 3,5-Dicyano-2,6-piperidinediones Using Lithium Nitride as a Convenient Source of Ammonia
作者:Li qiang Wu、Chunguang Yang、Liming Yang、Lijuan Yang
DOI:10.3987/com-08-11584
日期:——
A simple and efficient one-pot synthesis of 4-substituted-3,5-dicyano-2,6-piperidinediones was achieved in good yields via the three-component reaction of aldehyde or ketone, ethyl cyanoacetate, lithium nitride (Li 3 N) as a convenientsource of ammonia in MeOH.
通过醛或酮、氰基乙酸乙酯、氮化锂 (Li 3 N) 的三组分反应,以良好的收率实现了简单高效的一锅法合成 4-取代-3,5-二氰基-2,6-哌啶二酮作为 MeOH 中氨的方便来源。
Chemical and electrocatalytic cascade cyclization of Guareschi imides: ‘one-pot’ simple and efficient way to the 2,4-dioxo-3-azabicyclo[3.1.0]hexane scaffold
作者:Anatoly N. Vereshchagin、Michail N. Elinson、Evgeniya O. Dorofeeva、Dmitry V. Demchuk、Ivan S. Bushmarinov、Alexander S. Goloveshkin、Gennady I. Nikishin
DOI:10.1016/j.tet.2013.04.035
日期:2013.6
as mediator results in fast and efficient cyclization with formation of a substituted 3-azabicyclo[3.1.0]hexane system in 80–98%. The fast (30 min) electrocatalytic reaction proceeds smoothly under neutral and mild conditions. The use of electrocatalysis in a cascade cyclization reaction is an efficientapproach to the medicinallyrelevant 3-azabicyclo[3.1.0]hexane scaffold avoiding the inconvenient
The invention relates to 1,1-disubstituted cyclohexane derivatives containing one or more polymerisable groups, and to liquid-crystalline media comprising at least one compound of the formula I. At least one of the polymerisable groups is located at the geminally substituted position of the cyclohexane ring. The compounds are suitable for the stabilisation of liquid-crystalline phases. Examples of polymer-stabilised blue phases are indicated.
[EN] PROCESS FOR THE PREPARATION OF GABAPENTIN<br/>[FR] PROCEDE POUR LA PREPARATION DE GABAPENTINE
申请人:ZAMBON SPA
公开号:WO2006000562A1
公开(公告)日:2006-01-05
The present invention relates to a process for the preparation of gabapentin and, more in particular, to a method of synthesis of 1,1-cyclohexane acetic acid monoamide, an intermediate used in the preparation of gabapentin, comprising the basic hydrolysis reaction of α,¬-diaminocarbonyl-β,β-pentamethylene glutarimide.
Process for the preparation of gabapentin hydrochloride
申请人:Peng Zhenyun
公开号:US20090099362A1
公开(公告)日:2009-04-16
A process for preparation of gabapentin hydrochloride by converting 1,5-dicyano-2,4-dioxo-3-azaspiro[5,5]-undecane into 1,5-diaminoformyl-2,4-dioxo-3-azaspiro[5,5]-undecane at a temperature of 65° C. to 85° C. in the presence of a strong acid, and then carrying out Hofmann rearrangement under an alkaline condition. The starting material of the process is readily available. The process is simple, and can reduce the purification procedure of intermediates, reduce production cost, and obtain product with higher purity.