Occurrence of Piperidine-2, 6-dicarboxylic acid (trans) in a Red Alga, Porphyra tenera

Abstract

Porphyra tenera, an edible red alga, was found to contain a new acidic imino acid (C₇H_l1NO₄). This compound named teneraic acid is obtained from an alcoholic extract.
The chemical structure of teneraic acid was determined to be piperidine-2, 6-dicarbcxylic acid by means of NMR, Mass, and IR spectrometric studies and by chemical synthesis. The con-figuration of the compound was proved to be a trans form by ORD spectrometry.