C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 265/32 (2006.01)
Patent
CA 2139484
A process for making 2,5-morpholinediones of structure (I), wherein each R is independently hydrogen, C1-C12 hydrocar- byl, or substituted hydrocarbyl and at least one R is C1-C12 hydrocarbyl or C1-C12 substituted hydrocarbyl, by reacting an ester of free acid of an N-(.alpha.-hydroxyacyl)-.alpha.- amino acid substrate of structure (II) wherein each R and R3 is independently hy- drogen, C1-C12 hydrocarbyl or C1-C12 substituted hydrocarbyl and wherein at least one R is C1-C12 hydrocarbyl or C1-C12 substituted hydrocarbyl, over a fixed bed catalyst, the reaction being carried out at about 150°C to about 350°C, followed by collection of the effuent product. Such morpholinediones are useful as precursors for the preparation ofdepsipetide polymers and copolymers.
Bennett Jones Llp
E.i. Du Pont de Nemours And Company
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