Mukaiyama–Michael addition of a ketenesilylacetal on a cyclic α,β-unsaturated ketone, followed by the addition of a glyoxylic, aromatic or heteroaromatic imine. According to the nature of the silyl group the adducts resulting from this tandem process are isolated as ketones or as enoxysilanes. The presence of a coordinating group on the imine increases the rate of the reaction.
A Pd‐catalyzed carbonylation of α‐chloro ketones in the presence of imines leads to α‐alkylidene β‐oxo amides in good yields. This one‐pot synthetic method is highly stereoselective and affords amides only as (Z) isomers. This work increases the potential of Pd‐catalyzed reactions in the direct synthesis of carbonyl compounds.
Tandem Michael imino–aldol reactions catalyzed by samarium diiodide
作者:Nada Jaber、Jean-Claude Fiaud、Jacqueline Collin
DOI:10.1016/s0040-4039(01)01995-5
日期:2001.12
Samarium diiodide catalyzes a one-pot procedure allowing to perform sequentially the Michael addition of a ketenesilylacetal on a cyclic α,β-unsaturated ketone, followed by the addition of a glyoxylic or aromatic imine. The presence of a coordinating group on the imine increases the rate of the reaction.
π–π Stacking versus Steric Effects in Stereoselectivity Control: Highly Diastereoselective Synthesis ofsyn-1,2-Diarylpropylamines
作者:José L. García Ruano、José Alemán、Inés Alonso、Alejandro Parra、Vanesa Marcos、José Aguirre
DOI:10.1002/chem.200601893
日期:2007.7.16
2-diarylpropylamine derivatives. The sulfinyl group completely controls the configuration at C2 in the reactions of (S)-2. The configuration at C1 depends on the electron density of the ring adjacent to the iminic carbon atom which is modulated by pi-pi stacking interactions with the ring joined to the carbanionic centre. The stereoselectivity was controlled by modifying the acceptor character of the arylideneamine
Synthesis of β-lactams and β-aminoesters via high intensity ultrasound-promoted Reformatsky reactions
作者:Nathan A. Ross、Robert R. MacGregor、Richard A. Bartsch
DOI:10.1016/j.tet.2004.01.002
日期:2004.2
Reformatskyreactions of an imine, an α-bromoester, zinc dust and a catalytic amount of iodine in dioxane under high intensity ultrasound (HIU) irradiation from an ultrasonic probe are explored. A series of 16 aldimines with varying electronic demands is evaluated as potential electrophiles for reactions with three α-bromoesters of differing steric demands. This HIU method is successful for both enolizable