51 research outputs found
2-Acetyl-3,5,5,9-tetramethyl-6,7,8,9-tetrahydro-5H-benzocyclohepten-7-one
The title compound, C17H22O2, was semi-synthesized from a mixture of α-atlantone (Z) and α-atlantone (E), which were isolated from the essential oil of the Atlas cedar (cedrus atlantica). The molecule consists of fused six- and seven-membered rings. The seven-membered ring is in a screw-boat conformation
(±)-N-[4-Acetyl-5-methyl-5-(4-methylcyclohex-3-enyl)-4,5-dihydro-1,3,4-thiadiazol-2-yl]acetamide
The new title thiadiazole compound, C14H21N3O2S, was semi-synthesized starting from 1-(4-methylcyclohex-3-enyl)ethanone, a natural product isolated from Cedrus atlantica essential oil. The stereochemistry has been confirmed by single-crystal X-ray diffraction. The thiadiazoline ring is roughly planar, although it may be regarded as having a half-chair conformation. The cyclohexenyl ring has a half-chair conformation. The most interesting feature is the formation of a pseudo-ring formed by four molecules associated through N—H⋯O hydrogen bonds around a fourfold inversion axis, forming an R
4
4(28) motif
N-[4-Acetyl-5-methyl-5-(2-p-tolylpropyl)-4,5-dihydro-1,3,4-thiadiazol-2-yl]acetamide
The title heterocyclic compound, C17H23N3O2S, was synthesized from 4-(4-methylcyclohex-3-enyl)pent-3-en-2-one, which was isolated from Cedrus atlantica essential oil. The thiadiazole ring adopts a flattened envelope conformation, with the flap sp
3-hybridized C atom lying 0.259 (1) Å out of the plane of the other four atoms. The screw-related molecules are linked into chains along the b axis by intermolecular N—H⋯O hydrogen bonds
N-[4-Acetyl-5-isobutyl-5-(2-p-tolylpropyl)-4,5-dihydro-1,3,4-thiadiazol-2-yl]acetamide ethyl acetate hemisolvate
The racemic title compound, a new terpenoid, C20H29N3O2S·0.5C4H8O2, was synthesized from Cedrus Atlantica essential oil. The compound crystallizes with a disordered ethyl acetate solvent molecule. The thiadiazole ring is almost planar, with a maximum deviation from the mean plane of 0.015 (2) Å for the C atom connected to the isobutyl group and has a puckering amplitude of 0.026 (2) Å. The dihedral angle between the benzene and thiadiazole rings is 18.32 (8)°. The crystal packing involves intermolecular N—H⋯O hydrogen bonds
(4aS,10aS)-7-Hydroxy-8-isopropyl-1,1,4a-trimethyl-1,2,3,4,4a,9,10,10a-octahydrophenanthrene: a new diterpenoid compound
The new title diterpenoid compound, C20H30O, is a natural product isolated from Tetraclinis articulata wood via chloroform extraction. The asymmetric unit contains four molecules with the same S,S configuration, deduced from the chemical synthesis. Indeed, an overlay analysis, calculated using structure-matching software, shows that the four molecules can be superimposed. The central ring has a half-chair conformation, whereas the saturated ring displays a chair conformation
7-Hydroxy-8-isopropyl-1,1,4a-trimethyl-4a,9,10,10a-tetrahydro-phenanthren-2(1H)-one
The title compound, C20H26O2, was isolated from a chloroform extract of Tetraclinis articulata wood. The molecule contains three fused rings which exhibit different conformations. The non-aromatic oxo-substituted ring has a screw-boat conformation, while the central ring has a half-chair conformation. In the crystal, molecules are linked to each other by intermolecular O—H⋯O hydrogen bonds involving the carbonyl and hydroxy groups
N-[4-Acetyl-5-(2-methylprop-1-enyl)-5-(2-p-tolylpropyl)-4,5-dihydro-1,3,4-thiadiazol-2-yl]acetamide
The title heterocyclic compound, C20H27N3O2S, was synthesized from 2-(4-methylcyclohex-3-enyl)-6-methylhepta-2,5-dien-4-one, which was isolated from the essential oil Cedrus atlantica. The thiadiazole ring is essentially planar [maximum deviation 0.006 (2) Å] and it forms a dihedral angle of 18.08 (9)° with the benzene ring. The dihedral angle between the thiadiazole ring and the acetamide plane is 7.62 (10)°. In the crystal, molecules are linked into chains running along the c axis by intermolecular N—H⋯O hydrogen bonds
Hemisynthesis of New Triterpene Derivatives Using Oxidation by CrO3 and NaIO4-(RuCl3, 3H2O).
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