ABSTRACT. 2-~-5-OH-L-pipecolic -acid together with Z-cis-4-0H-i-pipecolic acid is obtained in a 7 : 3 ratio by reduction of the oxymercuration product of Z-L-baikiain (Z-I,2,5,6-;-tetrahydropyridine-2-carboxylic acid).fluoroacetate, thus giving access to the preparation of either of the two isomers.The opposite composition ratio is obtained using mercuric tri-INTRODUCTION.

ABSTRACT.acid and L-y-thiapipecolic acid with glycine or sarcosine are negatively buckled. of foldin; of the diketopiperazine ring increases in the y-thia-analog. effect of changing the solvent from chloroform to methanol. and of N-methylation of the Gly residue, on the buckle of the DKP ring is attempted.From '€I N M parameters we demonstrate that the cyclic dipeptides derived from L-pipecolic

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Z‐trans‐5‐OH‐L‐pipecolic acid together with Z‐cis‐4‐OH‐L‐pipecolic acid is obtained in a 7:3 ratio by reduction of the oxymercuration product of Z‐L‐baikiain (Z‐1, 2, 5, 6‐L‐tetrahydropyridine‐2‐carboxylic acid). The opposite composition ratio is obtained using mercuric trifluoroacetate, thus giving access to the preparation of either of the two isomers.

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