In the title compound, C(13)H(22)N(4)O(2)S(2), the six-membered ring displays a half-chair conformation. The olefin amine unit is close to being coplanar with the imidazolidine ring (r.m.s. deviation = 0.059 Å). The dithiol-ane ring adopts a twisted conformation. In the crystal, mol-ecules are linked by weak C-H⋯O inter-actions.

In the title mol-ecule, C(11)H(20)N(2)S, the five-membered ring has an envelope conformation and the cyclo-hexane ring is in a chair conformation. The N-H group is not involved in any intra- or inter-molecular inter-actions.

In the title compound, C(23)H(23)NO(5), the C(5)N ring adopts an envelope conformation with a C atom as the flap, whilst the saturated C(6) ring fused to it adopts a chair conformation. In the crystal, inversion dimers linked by pairs of N-H⋯O hydrogen bonds generate R(2) (2)(8) loops.

In the title mol-ecule, C(29)H(30)Br(2)N(2)O(3), the piperazine ring has a chair conformation and the C=C double bond has an E conformation. The dihedral angle between the bromo-benzene rings is 79.1 (3)°. In the crystal, mol-ecules are linked through C-H⋯O and C-H⋯Br hydrogen bonds.

In the title compound, C(21)H(21)ClN(2)O(2), the dihydro-isoxazole ring adopts an envelope conformation and the piperidinone ring is in a chair conformation. The dihedral angle between the two benzene rings is 84.2 (1)°. The crystal used was an inversion twin.

In the title compound, C(33)H(32)N(2)O(2), the polysubstituted piperidine ring adopts a chair conformation. The isoxazolidine ring is in an envelope conformation. In the crystal structure, intra- and inter-molecular C-H⋯π inter-actions involving the phenyl rings are observed.

In the title compound, C(11)H(18)N(4)O(2)S(2), the dithiol-ane ring displays an envelope conformation, the tetra-hydro-pyrimidine ring has a conformation that is between half-chair and screw-boat, and the imidazole ring is essentially planar (r.m.s. deviation = 0.0017 Å). No significant directional inter-molecular inter-actions are present in the structure.

The crystal structure of the title compoud, C(17)H(20)BrNO(3), contains three chiral centers, which all exhibit an S configuration. The C=C double bond has an E conformation. The cyclo-hexane ring is in a chair conformation. In the crystal, mol-ecules are linked by weak N-O⋯Br inter-actions [O⋯Br = 3.136 (4) Å].

In the title compound, C(22)H(26)OS(2), prepared from (-)-1R-cis-caronaldehyde, the 1,3-dithiane ring adopts a chair conformation. An intra-molecular O-H⋯S hydrogen bond influences the mol-ecular conformation. In the crystal, weak inter-molecular C-H⋯S and C-H⋯O hydrogen bonds link the mol-ecules into chains propagating along [010].

In the title compound, C(18)H(25)NO(4), the benzofuran ring is almost planar and the morpholino ring displays a chair conformation. The packing of compound has a one-dimensional structure constructed through inter-molecular O-H⋯O hydrogen bonds. The conformation is stabilized by intra-molecular C-H⋯N and C-H⋯O inter-actions.