132871-10-4Relevant articles and documents
Structure-Activity Relationship Studies on Oxazolo[3,4- a]pyrazine Derivatives Leading to the Discovery of a Novel Neuropeptide S Receptor Antagonist with Potent in Vivo Activity
Albanese, Valentina,Ruzza, Chiara,Marzola, Erika,Bernardi, Tatiana,Fabbri, Martina,Fantinati, Anna,Trapella, Claudio,Reinscheid, Rainer K.,Ferrari, Federica,Sturaro, Chiara,Calò, Girolamo,Amendola, Giorgio,Cosconati, Sandro,Pacifico, Salvatore,Guerrini, Remo,Preti, Delia
, p. 4089 - 4108 (2021/04/12)
Neuropeptide S modulates important neurobiological functions including locomotion, anxiety, and drug abuse through interaction with its G protein-coupled receptor known as neuropeptide S receptor (NPSR). NPSR antagonists are potentially useful for the treatment of substance abuse disorders against which there is an urgent need for new effective therapeutic approaches. Potent NPSR antagonists in vitro have been discovered which, however, require further optimization of their in vivo pharmacological profile. This work describes a new series of NPSR antagonists of the oxazolo[3,4-a]pyrazine class. The guanidine derivative 16 exhibited nanomolar activity in vitro and 5-fold improved potency in vivo compared to SHA-68, a reference pharmacological tool in this field. Compound 16 can be considered a new tool for research studies on the translational potential of the NPSergic system. An in-depth molecular modeling investigation was also performed to gain new insights into the observed structure-activity relationships and provide an updated model of ligand/NPSR interactions.
Efficient one-pot synthesis of enantiomerically pure: N -protected-α-substituted piperazines from readily available α-amino acids
Jida, Mouhamad,Ballet, Steven
supporting information, p. 1595 - 1599 (2018/02/09)
A new pathway towards enantiomerically pure 3-substituted piperazines, bearing a benzyl protecting group, has been developed in good overall yields (83-92%), starting from commercially available N-protected amino acids. The methodology represents an efficient and simple one-pot procedure, employing a synthetic sequence consisting of an Ugi-4 component reaction, a Boc-deprotection, an intramolecular cyclisation reaction and a final reduction (UDCR). From the benzyl protected precursors, the 2-substituted piperazines bearing a Boc-protecting group could consequently also be obtained via a simple protection and deprotection step of the corresponding piperazines. The practical utility of this methodology was demonstrated for chiral drug synthesis.
Synthesis and structure of 1,4-dipiperazino benzenes: Chiral terphenyl-type peptide helix mimetics
Maity, Prantik,Koenig, Burkhard
supporting information; experimental part, p. 1473 - 1476 (2009/04/10)
(Chemical Equation Presented) The terphenyl structure has been proven to be an ideal scaffold mimicking side-chain functionalities of peptidic α-helices. The synthesis of 1,4-dipiperazino benzenes, using stepwise transition metal-catalyzed N-arylation of chiral piperazines to a central benzene core is reported. The structure determination by X-ray crystallography reveals a geometrical arrangement of the hydrophobic side chains resembling the orientation of key i, i + 3, and i + 7 positions in a peptidic α-helix or in terphenyl helix mimetics.
