ABSTRACT
In the title sinomenine derivative, C(26)H(28)FNO(4)·1.5H(2)O, the dihedral angle between the two aromatic rings is 55.32â (6)°. The N-containing ring has an approximate chair conformation, while other two rings have approximate envelope and half-chair conformations. One water mol-ecule is located on a twofold symmetry axis. In the crystal, the water mol-ecules form O-Hâ¯O and O-Hâ¯N hydrogen bonds, bridging symmetry-related main mol-ecules.
ABSTRACT
In the title compound, C(26)H(31)NO(4), a sinomenine derivative, the angle between the two aromatic rings is 53.34â (4)°. The N-containing ring is in a chair conformation, while the other two non-planar rings are in a half-boat conformation. In the crystal, mol-ecules are linked by O-Hâ¯N inter-actions into a C(8) chain along [100].
ABSTRACT
The title compound, C(26)H(30)ClNO(4), a sinomenine derivative, has five six-membered rings, two of which are aromatic, with a dihedral angle of 34.13â (20)° between these. The N-containing ring and the fourth ring exhibit chair conformations, while the fifth ring approximates an envelope conformation. A single inter-molecular O-Hâ¯N hydrogen-bonding inter-action gives a one-dimensional chain structure which extends along the a axis. The absolute configuration for the mol-ecule has been determined.
ABSTRACT
In the title compound, C(26)H(28)Cl(N)O(4)·H(2)O, the dihedral angle betwene the two aromatic rings is 69.73â (6)°. The N-containing ring exhibits a chair conformation, while the other non-aromatic rings are in approximate envelope conformations. In the crystal, the water mol-ecule forms O-Hâ¯O and O-Hâ¯N hydrogen bonds and a C-Hâ¯O link also occurs.
ABSTRACT
Chiral N-heterocyclic carbene catalyzed annulations of ynals and enals with 1,3-dicarbonyls have been described. The two reactions provided direct and efficient methods for enantioselective synthesis of functionalized dihydropyranones. Comparatively, the reactions starting from ynals were atom-economical; furthermore the reactions of enals demonstrated broader substrate compatibility.
ABSTRACT
In the title compound, C(26)H(28)INO(4)·H(2)O, benzene rings are inclined at a dihedral angle of 69.9â (1)°. The N-containing ring exhibits a chair conformation, while the other rings approximate to envelope conformations. In the crystal, the uncoordinated water mol-ecule forms inter-molecular O-Hâ¯O and O-Hâ¯N hydrogen bonds.