title: 1-amino-2-phenylcyclopentane-1-carboxylic acid: a conformationally restricted phenylalanine analogue.
abstract: DFT calculations at the B3LYP/6-311G(d,p) level have been used to investigate the intrinsic conformational preferences of 1-amino-2-phenylcyclopentane-1-carboxylic acid (c5Phe), a constrained analogue of phenylalanine in which the alpha and beta carbons are included in a cyclopentane ring. Specifically, the N-acetyl-N'-methylamide derivatives of the cis and trans stereoisomers, where cis and trans refer to the relative position between the amino group and the phenyl ring, have been calculated. Solvent effects have been examined using a self-consistent reaction field (SCRF) method. Results indicate that the conformational space of the cis stereoisomer is much more restricted than that of the trans derivative both in the gas phase and in solution.
authors: Departament de Química, Escola Politècnica Superior, Universitat de Lleida, c/Jaume II No. 69, Lleida E-25001, Spain. jcasanovas@quimica.udl.cat
authors: Jordi
authors: J
authors: Casanovas
authors: Ana I
authors: AI
authors: Jiménez
authors: Carlos
authors: C
authors: Cativiela
authors: Ruth
authors: R
authors: Nussinov
authors: Carlos
authors: C
authors: Alemán
mesh_terms: D002264:Carboxylic Acids / Q000737:chemistry*; D003517:Cyclopentanes / Q000737:chemistry*; D006860:Hydrogen Bonding; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D010649:Phenylalanine / Q000031:analogs & derivatives* / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: C527439:1-amino-2-phenylcyclopentane-1-carboxylic acid; D002264:Carboxylic Acids; D003517:Cyclopentanes; D010649:Phenylalanine