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(E)-(N-Acyl-oxazolidinone)-eneglycinates were synthesized with high stereoselectivity and in good yield by condensation of aldehydes with glycinates. (Z)-Eneglycinates could be prepared in high purity and moderate yield by transformation of (E)-eneglycinates under mild conditions. The effect on the (E)/(Z)-configuration of eneglycinates of steric hindrance by α-substituents on the aldehyde was also examined. The software MMFF94 was used to explain the transformation of the thermodynamic product into the kinetic product and a plausible mechanism is given.