5,6,7,8-Tetra­hydro-4aH-thieno­[3,2-b]­quinolizin-4(10H)-one

In the title compound, C₁₁H₁₃NOS, the thio­phene ring is planar while the central six-membered ring has a half-chair conformation and the second ring of the quinolizine moiety is in a chair conformation. The angles at the N atom sum to 331.22°, indicating pyramidalization of this atom.

Methyl 2-methyl-5-oxo-4-(2-thienyl)-1,5,7,8,9,10-hexa­hydro-4H-pyrido­[2′,3′:3,4]­pyrrolo­[1,2-a][1,3]­diazepine-3-carboxyl­ate

The crystal structure of the title compound, C₁₈H₁₉N₃O₃S, is formed by single mol­ecules linked by N—H...O hydrogen bonds into infinite linear chains along the ac diagonal. The thio­phene ring is nearly planar and is approximately perpendicular to the mean plane of the 1,4-di­hydro­pyridine ring. The ester group has a trans geometry with respect to the adjacent ring double bond. The di­hydro­pyridine and pyrrole rings are coplanar.

(10aS)-7-Methoxy-1,10a-di­hydro­pyrrolo­[1,2-b]­iso­quinoline-3,10(2H,5H)-dione

The crystal structure of the title compound, C₁₃H₁₃NO₃, is stabilized by dipole-dipole and van der Waals forces. The pyrrolidine ring is almost planar, while the central six-membered ring of the indolizine moiety adopts a sofa conformation.

Diethyl 2,6-dimethyl-4-[5-(4-nitro­phen­yl)-2-fur­yl]-1,4-dihydro­pyridine-3,5-dicarboxyl­ate

In the crystal structure of the title compound, C₂₃H₂₄N₂O₇, mol­ecules are linked by N—H...O hydrogen bonds into infinite chains. The substituted 1,4-dihydro­pyridine ring has a shallow boat conformation. The 4-nitro­phenyl and 2-furyl rings are twisted in the same direction and are approximately perpendicular to the 1,4-dihydro­pyridine (DHP) ring. The carbonyl groups of the ester groups, at positions 3 and 5 in the 1,4-DHP ring, have different (cis/trans) configurations with respect to the double bonds in the 1,4-DHP ring