31202-36-5Relevant academic research and scientific papers
SYNTHESIS OF PYROGLUTAMYLASPARAGINE AMIDE DIPEPTIDE FRAGMENT OF VASOPRESSIN, AND THE STEREOSELECTIVITY OF ITS MNEMIC EFFECT
Gudasheva, T. A.,Rozantsev, G. G.,Ostrovskaya, R. U.,Trofimov, S. S.,Voronina, T. A.,et al.
, p. 14 - 17 (1995)
Four diastereomers of pGlu-Asn-NH2 were synthesized.They were considered on one hand as a peptide analogue of piracetam, and on the other as an N-terminal fragment of the major metabolite of vasopressin 4, Cyt6>AVP(4-9).The influence of these diastereomers on the memory of rats was studied in the passive avoidance conditioned reflex test.It was shown that L-pGlu-L-Asn-NH2 and D-pGlu-D-Asn-NH2 in the same doses facilitate the training of rats; D-pGlu-D-Asn-NH2 is inactive, and L-pGlu-D-Asn-NH2 has amnestic activity.These facts suggest a receptor mechanism for the action of the dipeptide pGlu-Asn-NH2 and are the basis for a hypothesis for the topology of the nootropic receptor binding site.
Dichlorotris(dimethylamino)phosphorane as Dehydration Reagent for the Preparation of Activated (-ONp, -OPcp, -NSu)Esters of N-Protected Multifunctional Amino Acids
Appel, Rolf,Glaesel, Ursula
, p. 3511 - 3516 (2007/10/02)
Dichlorotris(dimethylamino)phosphorane (5) is an excellent reagent for the preparation of the activated esters of N-protected amino acids 7-9.Besides 4-nitrophenyl-, pentachlorophenyl-, and N-hydroxysuccinimide esters of various N-protected amino acids, in the presence of HOBt benzyloxycarbonyl-threonine N-hydroxysuccinimide ester was obtained for the first time.
