TITANIUM COMPOUNDS AND PROCESS FOR CYANATION OF IMINES
申请人:Seayad Abdul Majeed
公开号:US20110319629A1
公开(公告)日:2011-12-29
The present invention relates to titanium catalysts for synthesis reactions produced by bringing a reaction mixture comprising a titanium alkoxide and a ligand in contact with water, wherein the ligand is represented by the general formula (e): wherein R
1
, R
2
, R
3
, and R
4
are independently a hydrogen atom, an alkyl group, or the like, and (A) represents a group with two or more carbon atoms. The titanium catalysts may be isolated in solid form and may be stored. The invention further relates to a process for cyanation of imines, wherein the process comprises reacting an imine with a cyanating agent in the presence of the titanium catalyst.
The combination of Et2Zn and RhCl(PPh3)3 led to the facile generation of a rhodium–hydride complex (Rh–H) that catalyzed the 1,4-reduction of α,β-unsaturatedesters. The resulting rhodium enolate performed as a Reformatsky-type reagent and reacted with various imines to give syn-β-lactams in good to excellent yields with high diastereoselectivity.
Et 2 Zn和RhCl(PPh 3)3的组合导致容易生成铑-氢化物络合物(Rh-H),该络合物催化α,β-不饱和酯的1,4-还原。所得的烯醇铑作为Reformatsky型试剂起作用,并与各种亚胺反应,以良好的非对映异构体收率以优异的产率得到合成的-β-内酰胺。
A new synthesis of pyrrolidines via imino-aldol reaction of (2-trimethylsilylmethyl)cyclopropyl ketones with imines
作者:Veejendra K. Yadav、Archana Gupta
DOI:10.1016/j.tetlet.2008.03.117
日期:2008.5
A newsynthesis of 2,3,5-trisubstituted pyrrolidines from the imino-aldols formed from Lewis acid-mediated reactions of (2-trimethylsilylmethyl)cyclopropylketones with benzylimines is described. The ring closure of the imino-aldols formed from the benzylimines of 2-chloro-, 2-fluoro-, and 2-trifluoromethylbenzaldehydes proceeds with predominantly 2,5-anti selectivity to generate the corresponding
[EN] TITANIUM COMPOUNDS AND PROCESS FOR CYANATION OF IMINES<br/>[FR] COMPOSÉS DE TITANE ET PROCÉDÉ DE CYANATION DES IMINES
申请人:AGENCY SCIENCE TECH & RES
公开号:WO2010093327A1
公开(公告)日:2010-08-19
The present invention relates to titanium catalysts for synthesis reactions produced by bringing a reaction mixture comprising a titanium alkoxide and a ligand in contact with water, wherein the ligand is represented by the general formula (e), wherein R1, R2, R3, and R4 are independently a hydrogen atom, an alkyl group, or the like, and (A) represents a group with two or more carbon atoms. The titanium catalysts may be isolated in solid form and may be stored. The invention further relates to a process for cyanation of imines, wherein the process comprises reacting an imine with a cyanating agent in the presence of the titanium catalyst.
Catalytic Acylcyanation of Imines with Acetylcyanide
作者:Benjamin List、Subhas Pan、Jian Zhou
DOI:10.1055/s-2006-951543
日期:——
Aldimines react with acetyl cyanide in the presence of a catalytic amount of a thiourea catalyst to give the corresponding N-acetylated amino nitriles in high yields. The scope of the reaction is broad and both aromatic as well as aliphatic aldimines can readily be used.