Lewis Acid-catalysed Aza-Diels-Alder<i>versus</i>Mannich Reactions of<i>N</i>-Diethyl Phosphoryl Imino Dienophiles with Oxygenated Dienes and Application of a Chiral Lewis Acid
作者:Andrew Whiting、Lorenzo Di Bari、Stéphane Guillarme、Stephen Hermitage、Judith A. Howard、David A. Jay、Gennaro Pescitelli、Dmitrii S. Yufit
DOI:10.1055/s-2004-817742
日期:——
N-Phosphoryl imines react with oxygenated dienes in the presence of Lewis acids to provide either the formal aza-Diels-Alder adduct, or the acyclic Mannich-type addition product, depending upon the catalyst and work up used, which is in agreement with the hypothesis that these reactions are mediated by zwitterionic Lewis acid-complex intermediates, rather than a concerted cycloaddition transition-state followed by hydrolytic ring opening. Stoichiometric asymmetric induction can be achieved using a zinc(II)-binol complex, producing up 77% ee.
New Synthesis of Pyrrolidinesvia Reaction ofγ-Halocarbanions with Imines
作者:Mieczysław Mąkosza、Marek Judka
DOI:10.1002/hlca.200590132
日期:2005.7
3-chloropropyl pentachlorophenyl sulfone (=pentachloro[(3-chloropropyl)sulfonyl]benzene; 1; Ar=C6Cl5), add to electron-deficient formal imines 3a–l to produce anionic adducts that enter intramolecular substitution leading to substituted pyrrolidines. This new and simple synthesis of pyrrolidines mimics a 1,3-dipolar cycloaddition, although it proceeds in two distinct steps.
由3-氯丙基五氯苯基砜(=五氯[(3-氯丙基)磺酰基]苯;1; Ar = C 6 Cl 5)产生的具有适当亲核性的γ-氯碳阴离子加到电子贫乏的形式亚胺3a – l中,产生阴离子进入分子内取代的加合物导致取代的吡咯烷。吡咯烷的这种新的和简单的合成模拟了1,3-偶极环加成,尽管它以两个不同的步骤进行。
Direct synthesis of protected diethyl 1,2-diaminoalkylphosphonates
作者:Roman Błaszczyk、Tadeusz Gajda
DOI:10.1016/j.tetlet.2007.06.063
日期:2007.8
An efficient, diastereoselective synthesis of 5-substituted (2-thioxo-imidazolidin-4-yl)phosphonic acid diethyl esters from metallated diethyl isothiocyanatomethylphosphonate and activated imines has been developed. The three-step transformation of imidazolidine-2-thione derivatives into 1,2-diamiiioalkylphosphonic acids is also described. (c) 2007 Elsevier Ltd. All rights reserved.
Synthesis of α-Arylalkylamines by Addition of Grignard Reagents to N-(Diethoxyphosphoryl)aldimines
作者:Andrzej Zwierzak
DOI:10.1055/s-1999-3496
日期:1999.6
The thermally induced synthesis of N-(diethoxyphosphoryl)aldimines
作者:Andrzej Zwierzak、Anna Napieraj
DOI:10.1016/0040-4020(96)00420-6
日期:1996.6
The reaction of diethyl phosphoroamidate (2) with aromatic aldehyde diethyl acetals (1) carried out at 120 – 160°C provides a simple, one-step preparation of N-(diethoxyphosphoryl)aldimines (3a−b). The extension of this reaction to aliphatic aldehyde diethyl acetals failed to give the expected imines.