1-amino-2-phenylcyclopentane-1-carboxylic acid: a conformationally restricted phenylalanine analogue.
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.
Casanovas
Jordi
J
Departament de Química, Escola Politècnica Superior, Universitat de Lleida, c/Jaume II No. 69, Lleida E-25001, Spain. jcasanovas@quimica.udl.cat
Jiménez
Ana I
AI
Cativiela
Carlos
C
Nussinov
Ruth
R
Alemán
Carlos
C
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
C527439:1-amino-2-phenylcyclopentane-1-carboxylic acid; D002264:Carboxylic Acids; D003517:Cyclopentanes; D010649:Phenylalanine