N-Alkylation of N-arylsulfonyl-α-amino acid methyl esters by trialkyloxonium tetrafluoroborates
作者:Rosaria De Marco、Maria Luisa Di Gioia、Angelo Liguori、Francesca Perri、Carlo Siciliano、Mariagiovanna Spinella
DOI:10.1016/j.tet.2011.10.042
日期:2011.12
tetrafluoroborate is the reagent of choice for the direct and quantitative N-methylation. Further we extend our evaluation to the use of triethyloxonium tetrafluoroborate. This reagent shows to be very efficient in order to prepare N-ethyl derivatives of N-arylsulfonyl-α-amino acid methyl esters. An experimental protocol similar to that used for N-methylation with trimethyloxonium tetrafluoroborate is applied
An Efficient Preparation of <i>N</i>-Methyl-α-amino Acids from <i>N</i>-Nosyl-α-amino Acid Phenacyl Esters
作者:Antonella Leggio、Emilia Lucia Belsito、Rosaria De Marco、Angelo Liguori、Francesca Perri、Maria Caterina Viscomi
DOI:10.1021/jo901643f
日期:2010.3.5
In this paper we describe a simple and efficient solution-phase synthesis of N-methyl-N-nosyl-α-amino acids and N-Fmoc-N-methyl-α-amino acids. This represents a very important application in peptidesynthesis to obtain N-methylated peptides in both solution and solidphase. The developed methodology involves the use of N-nosyl-α-amino acids with the carboxyl function protected as a phenacyl ester and
A novel approach to amino acid synthesis: acid-assisted reactions with dimethyl carbonate for efficient <i>O</i>-methylated, <i>N</i>,<i>O</i>-methylated and <i>N</i>-formylated derivatives
作者:Pattamabhorn Worsawat、Pakin Noppawan、Nontipa Supanchaiyamat、Himmy Wu、Con R. McElroy、Andrew J. Hunt
DOI:10.1039/d3gc03455k
日期:2024.4.2
A novel and efficient method for the modification of aminoacids using a dimethyl carbonate (DMC) and acid system has been developed. N-Methylation, N,O-dimethylation, and N-formylation of various aminoacids have been successfully achieved using this simple acid-assisted method (>99% conversions and >99% yields) and the modified aminoacids were fully characterized using NMR spectroscopy. This method
The three-component Petasis borono-Mannich reaction starting with easily accessible N-protected α-amino aldehydes produces efficiently and diastereoselectively 1,2-trans-diamines with an enantiomeric excess of up to 98%.