Synthesis of a key intermediate in the diaminopimelate pathway to L-Lysine: 2,3,4,5-tetrahydrodipicolinic acid
作者:Ewan J.T. Chrystal、Lynda Couper、David J. Robins
DOI:10.1016/0040-4020(95)00618-i
日期:1995.9
2,3,4,5-Tetrahydrodipicolinic acid (3) is a key intermediate in the diaminopimelate (DAP) pathway to L-lysine (7). It was synthesized as the stable racemic potassium salt (25) from dipicolinic acid (14) by esterification, hydrogenation to the cis-diester (17), followed by elimination of p-toluenesuifinic acid from the N-toluenesulfonyl derivative (24) of dimethyl cis-piperidine-2,6-dicarboxylate with concomitant cleavage of the ester groups. (+/-)-2,3,4,5-Tetrahydrodipicolinic acid is unstable in neutral or acidic solution, and in basic solution it exists in equilibrium with the corresponding enamine (27) and 2-oxo-6-aminoadipate (26).