title: Novel 2- and 5-azido-N-(diphenylcarbamoyl)proline methyl esters. Examples of a novel proline oxidation.
abstract: The crystal structures of two azido-substituted proline derivatives are reported. Racemic 2-azido-1-(diphenyl-carbamoyl)proline methyl ester, (I), C19H19N5O3, is resolved upon crystallization from methylene chloride-diethyl ether. The azido moieties are nonlinear with N--N--N angles of 173 (1) and 170.3 (2) degrees for (I) and (II) [cis-5-azido-N-(diphenylcarbamoyl)proline methyl ester, C19H19N5O3], respectively. Close intramolecular contacts between the carbonyl O atom of the amide and the central N atom of the azido group are found. The contact distances between N7 and O14 are 2.780 (14) and 2.815 (2) A for (I) and (II), respectively.
authors.affiliation: Department of Chemistry and Biochemistry, University of Texas at Austin, Austin 78712, USA.
authors.forename: V M
authors.initials: VM
authors.lastname: Lynch
authors.forename: C
authors.initials: C
authors.lastname: Hulme
authors.forename: P
authors.initials: P
authors.lastname: Magnus
authors.forename: B E
authors.initials: BE
authors.lastname: Davis
mesh_terms: D018360:Crystallography, X-Ray; D008958:Models, Molecular; D010084:Oxidation-Reduction; D011392:Proline / Q000031:analogs & derivatives* / Q000737:chemistry*
chemical_list: C098262:2-azido-N-(diphenylcarbamoyl)proline methyl ester; C098263:5-azido-N-(diphenylcarbamoyl)proline methyl ester; D011392:Proline