title: Structure of (3S)-3-tert-butyloxycarbonylamino-2-piperidone.
abstract: C10H18N2O3, Mr = 214.27, monoclinic, P2(1), a = 15.515 (2), b = 6.730 (1), c = 12.541 (2) A, beta = 113.6 (2) degrees, V = 1200.0 A3, Z = 4, Dx = 1.186 g cm-3, lambda(Mo K alpha) = 0.71069 A, mu = 0.54 cm-1, F(000) = 464, T = 295 K. The final R value for 1611 observed (3139 unique) reflections is 0.055. In both the independent molecules A and B of the asymmetric unit of the title compound, the conformation of the urethane moiety is trans. The lactam group of molecule A is non-planar, the C(9)-N(2)-C(10)-C(6) torsion angle being 12.4 (14) degrees. One main difference between molecules A and B is in the value of the phi[C(5)-N(1)-C(6)-C(10)] torsion angle [52.3 (11) degrees for molecule A while -86.5 (10) degrees for molecule B] as a consequence of a rotation of the ring relative to the tert-butyloxycarbonylamino substituent. A second major difference is the delta-lactam ring conformation which is approximate half-chair for molecule A while boat for molecule B.
authors.affiliation: Department of Organic Chemistry, University of Padova, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Valle
authors.forename: M
authors.initials: M
authors.lastname: Crisma
authors.forename: C
authors.initials: C
authors.lastname: Toniolo
authors.forename: K L
authors.initials: KL
authors.lastname: Yu
authors.forename: R L
authors.initials: RL
authors.lastname: Johnson
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003460:Crystallization; D003461:Crystallography; D015394:Molecular Structure; D010880:Piperidines; D010881:Piperidones
chemical_list: D010880:Piperidines; D010881:Piperidones; C062508:3-tert-butyloxycarbonylamino-2-piperidone