| 摘要 |
1,3-Di(alkoxycarbonylamino)propanes of the general formula I <IMAGE> (I) where R1, R2 and R3 can be identical or different and each is hydrogen, or an aliphatic, cycloaliphatic, araliphatic or aromatic radical, and R4 is an aliphatic, cycloaliphatic or araliphatic radical, are prepared by reacting an alpha , beta -unsaturated aldehyde with a carbamic acid ester by reacting in a first stage as the alpha , beta -unsaturated aldehyde a compound of the general formula II <IMAGE> (II) where R1, R2 and R3 have the abovementioned meanings, with a carbamic acid ester of the general formula III <IMAGE> (III) where R4 has the abovementioned meanings, at 0 DEG -150 DEG C. to give a 1,1,3-tri(alkoxycarbonylamino)propane of the general formua IV <IMAGE> (IV) where R1, R2, R3 and R4 have the abovementioned meanings, and in a second stage heating the compound of the general formula (IV) in the presence of a hydrogenation catalyst and hydrogen under 1-300 bar at 100 DEG -300 DEG C.
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