The Vinylogous Mannich Reaction: An Efficient Access to Substituted Nicotinonitriles
作者:Nikolaus Risch、Andreas Winter
DOI:10.1055/s-2003-42044
日期:——
A straightforward method for the preparation of substituted nicotinonitriles has been developed. Starting from conjugated β-enaminonitriles and iminium salts, this methodology establishes a convenient access to 6-aryl- (5), 6-amino- (16) and 6-carboxylic ester-substituted derivatives 14 and as well to acetic acid-substituted pyrroles 12.
[EN] PRODUCTION OF AMINES VIA A HYDROAMINOALKYLATION REACTION<br/>[FR] PRODUCTION D'AMINES PAR RÉACTION D'HYDROAMINOALKYLATION
申请人:UNIV WIEN
公开号:WO2019219942A1
公开(公告)日:2019-11-21
Provided is a process for producing an amine via a hydroaminoalkylation reaction of a non-aromatic C-C double bond or C-C triple bond, said process comprising a step of reacting a compound comprising a non-aromatic C-C double bond or C-C triple bond with a reactive component which is obtainable by combining an aminal or a hemiaminal ether with an acidic medium comprising trifluoroacetic acid, wherein the aminal contains two amino groups independently selected from a secondary and a tertiary amino group that are linked by a methylene group wherein one hydrogen atom may be replaced by a further substituent, and at least one of the amino groups carries a hydrogen atom at a carbon atom bound in α-position to its nitrogen atom, and the hemiaminal ether contains a secondary or a tertiary amino group which carries a hydrogen atom at a carbon atom bound in α-position to its nitrogen atom, and the secondary or tertiary amino group is linked to an alkoxy group by a methylene group wherein one hydrogen atom may be replaced by a further substituent.
Direct Aminoalkylation of α-Branched Aldehydes with in situ Generated Glycine Cation Equivalents
作者:Nikolaus Risch、Stefan Piper
DOI:10.1055/s-2004-829536
日期:——
The efficient synthesis of β-formyl-α-aminocarboxylates 4 by direct aminoalkylation of aldehydes with in situ generated ternaryiminiumsalts from inexpensive starting materials is described. These compounds are easily transformed into α-amino-β,β-dialkyl-γ-butyrolactones 10 and a,a-dialkyl-β-dialkylamino-butane-1,4-diols 11 and can be used as versatile building blocks.
General acid-mediated aminolactone formation using unactivated alkenes
作者:David Just、Carlos R. Gonçalves、Uroš Vezonik、Daniel Kaiser、Nuno Maulide
DOI:10.1039/d3sc04073a
日期:——
excellent functional group tolerance and chemoselectivity. The synthetic versatility of the products is demonstrated through a range of transformations, notably exploiting stereospecificrearrangement chemistry to produce sterically congested scaffolds.