They're not epoxides, but Jacobsen rendered a reaction for synthesizing these compounds asymmetrically using a thio-  urea catalyst that binds the two reactants using hydrogen bonds.
They're not epoxides, but Jacobsen rendered a reaction for synthesizing these compounds asymmetrically using a thio-  urea catalyst that binds the two reactants using hydrogen bonds. Another enantioselective synthesis of these compounds  uses an Evans oxazo-lidinone to direct the addition of an electrophilic azide species alpha to a carbonyl, then generates the product by reduction of the azide followed by peroxide cleavage of the auxiliary. One method of identifying these  compounds reacts them with (*) phenyl-isothiocyanate. One reaction for synthesizing these compounds reacts an aldehyde with ammonia to create an iminium, which is then attacked by a cyanide anion that is converted to a carboxylic acid upon workup. The dihedral angles of these compounds make up the axes of Ramachandran plot, and examples of them include glutamate. For 10  points, name these compounds linked by peptide bonds, the building blocks of proteins.
They're not epoxides, but Jacobsen rendered a reaction for synthesizing these compounds asymmetrically using a thio-  urea catalyst that binds the two reactants using hydrogen bonds.
amino acids