Preparation of mono-substituted malonic acid half oxyesters (SMAHOs)
作者:Tania Xavier、Sylvie Condon、Christophe Pichon、Erwan Le Gall、Marc Presset
DOI:10.3762/bjoc.17.135
日期:——
The use of mono-substituted malonic acid half oxyesters (SMAHOs) has been hampered by the sporadic references describing their preparation. An evaluation of different approaches has been achieved, allowing to define the best strategies to introduce diversity on both the malonic position and the ester function. A classical alkylation step of a malonate by an alkyl halide followed by a monosaponification
Synthesis and reduction of endothiodipeptides containing malonic acid derivatives
作者:Dirk Krumme、Harald Tschesche
DOI:10.1016/s0040-4020(99)00084-8
日期:1999.3
Amides of malonicacidderivatives and protected dipeptides containing amino malonicacid have been synthesized and converted into the corresponding monothio analoga and endothiodipeptides. By reduction of the thioamides terminal protected β-carboxy amino derivatives were obtained. Reduction of endothiodipeptides containing amino malonicacid as the carboxy component resulted in protected ψ[CH2NH]
Enantioselective α-Amination of Acyclic 1,3-Dicarbonyls Catalyzed by N-Heterocyclic Carbene
作者:Surojit Santra、Ujjwal Maji、Joyram Guin
DOI:10.1021/acs.orglett.9b04232
日期:2020.1.17
Herein, we describe a method for the catalytic enantioselective α-amination of α-substituted acyclic 1,3-ketoamides and 1,3-amidoesters that affords the products possessing N-substituted quaternary stereocenters with a chiral N-heterocycliccarbene (NHC). The reaction is based on the utilization of an intrinsic Brønsted base characteristic of NHC that enables the catalytic formation of a chiral ion
Decarboxylative Claisen Condensations with Substituted Malonic Acid Half Oxyesters
作者:Marc Presset、Tania Xavier、Parvine Tran、Apolline Gautreau、Erwan Le Gall
DOI:10.1055/a-1950-5110
日期:2023.2
A decarboxylative Claisen condensation involving substituted malonicacid half oxyesters (SMAHOs) as pronucleophiles has been developed. The addition of their magnesium enolates to various acyl donors allows the synthesis of functionalized α-substituted β-keto esters in moderate to excellent yields (13–96%). In addition to acyl chlorides and acid anhydrides, these conditions proved efficient for the
Decarboxylative Amination of SMAHOs by Dialkyl Azodicarboxylates
作者:Marine Pinaud、Erwan Le Gall、Marc Presset
DOI:10.1002/ejoc.202400128
日期:2024.4.22
The organocatalyzed decarboxylative addition of substituted malonic acid half oxyesters (SMAHOs) to dialkyl azodicarboxylates led to the formation of α-aminoester derivatives. The reaction can be performed under mild reaction conditions using 1,4-diazabicyclo[2.2.2]octane (DABCO) as a catalyst and displayed a rather important scope.