A Practical and Efficient Green Synthesis of β-Aminophosphoryl Compounds via the Aza-Michael Reaction in Water
作者:Ekaterina V. Matveeva、Anatoly E. Shipov、Irina L. Odinets
DOI:10.1080/10426507.2010.511358
日期:2011.3.31
as a solvent (without any cosolvent) promotes the aza-Michael reaction of diethyl vinylphosphonate and diphenylvinylphosphine oxide with a wide range of N-nucleophiles. The solubility of the starting phosphorus substrate in water does not play a crucial role in the reaction course, decreasing to some extent the reaction rate. The reaction can be performed either at room temperature or under reflux to
Synthesis of (optically active) sulfur-containing trifunctional amino acids by radical addition to (optically active) unsaturated amino acids
作者:Quirinus B. Broxterman、Bernard Kaptein、Johan Kamphuis、Hans E. Schoemaker
DOI:10.1021/jo00049a041
日期:1992.11
Sulfur-based radicals, generated from R-S-H-type precursors (R = alkyl, acyl) with AIBN, smoothly add to alpha-allylglycines protected at none, one, or both of the amino acid functions (NH2 and/or CO2H). Sulfur-containing trifunctional amino acids were obtained in good to excellent yields (64-100%). The solvent used for the reaction is critical. Optimal results were obtained when both the unsaturated amino acid and RSH dissolve completely in the medium (dioxane/water or methanol/water are good solvent systems). The scope of the reaction includes alpha-substituted alpha-allylglycine and derivatives as well as beta-substituted beta-allyl-beta-ammo alcohols. In the case of optically active alpha-allylglycine derivatives, radical addition is accompanied by a small amount of racemization, the amount depending on the type of protection and R-S-H. The products are easily optically enriched by crystallization. Addition of sulfur-based radicals to alpha-allylglycine is believed to be an example of a general method for synthesizing optically active trifunctional amino acids from unsaturated amino acids.
Design of ligands derived from sulfur containing amino acids for enantioselective cross coupling catalyzed by nickel. Intramolecular participation of sulfide
作者:Bindert K Vriesema、Richard M Kellogg
DOI:10.1016/s0040-4039(00)84446-9
日期:1986.1
Resolution of 2-amino-5-thiomethyl pentanoic acid (homomethionine) with aminopeptidase from or chiral phosphoric acids.
作者:B.K Vriesema、H ten Hoeve、H Wynberg、Richard M Kellogg、W.H.J Boesten、E.M Meijer、H.E Schoemaker