Synthesis and NMD A Antagonistic Properties of the Enantiomers of 4??(3??phosphonopropyl) piperazine??2??carboxylic acid (CPP) and of the unsaturated analogue (E) …
Abstract The (R)-and (s)-enantiomers of 4-(3-phosphonopropyl) piperazine-2-carboxylic acid (D-and L-CPP, resp.; 15 and 16, resp.), and of its unsaturated analogue (E)-4-(3- phosphonoprop-2-enyl) piperazine-2-carboxylic acid (D-and L-CPP-ene, resp.; 13 and 14, resp.) were prepared. The absolute configuration of the enantiomers was determined by a chemical correlation of the menthyl ester 7 with D-asparagine. The affinity of these ...