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Rac-(3aR,6aR)-(E)-Methyl 2-(3a-methyl-perhydro-furo[3,2-b]furan-2-yl-idene)acetate.

ABSTRACT: The constitution and relative configuration at the stereogenic centres and stereochemistry of the C-C double bond formed during Pd(II)-catalysed domino reaction was established by X-ray analysis of the title compound, C(10)H(14)O(4). The asymmetric unit contains two mol-ecules.

SUBMITTER: Bellovicova L

PROVIDER: S-EPMC3007948 | biostudies-literature |

REPOSITORIES: biostudies-literature

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[(2S,3aR,6aR)-5-Oxohexa-hydro-furo[3,2-b]furan-2-yl]methyl acetate.

Project description:The title compound, C9H12O5, is a bicyclic lactone, presenting a 2,6-dioxabi-cyclo-[3.3.0]octan-3-one skeleton, which was obtained through an intra-molecular lactonization. The bicyclic lactone presents a cis ring-junction and a 1,5-trans-substituted tetra-hydro-furan. Both five-membered rings are in twisted envelope conformations with one of the fused C atoms as the flap. The dihedral angle between the mean planes of the bicyclic lactone residue, defined by the di-hydro-furan-2(3H)-one and the tetra-hydro-furan rings, is 69.5?(2)°. The atoms of the ester chain are coplanar [maximum deviation = 0.013?(2)?Å]. The absolute structure was not determined.

| S-EPMC3648296 | biostudies-literature

(3R,3aR,6R,6aR)-Hexa-hydro-furo[3,2-b]furan-3,6-diyl dibenzoate.

Project description:The title compound, C20H18O6, prepared from d-mannitol by a two-step procedure, is a functionalized fused bis-tetra-hydro-furan. In the central fragment, consisting of two fused tetra-hydro-furan rings, one O atom and its two adjacent C atoms, a methyl-ene and a bridgehead C atom, are disordered over two sets of sites with an occupancy ratio of 0.735?(9):0.265?(9). In the major component, the ring containing the disordered O atom is a half-chair conformation with twisted methylene and benzoate-substituted C atoms, whereas the other ring has a half-chair or T-form conformation. In the minor component, the ring with the disordered O atom has an envelope conformation, with the O atom as the flap, and the other ring has a half-chair conformation, with the O atom and the other bridgehead CH atom being twisted. The two aromatic rings are inclined to one another by 20.00?(12)°. In the crystal, adjacent molecules are linked via C-H?? interactions, forming chains propagating along [010].

| S-EPMC3884481 | biostudies-literature

(3R,3aS,6R,6aR)-3-(1-Nitro-eth-yl)perhydro-furo[3,2-b]furan-3,6-diol.

Project description:The mol-ecule of the title compound, C(8)H(13)NO(6), a sucrose derivative, consists of two fused tetra-hydro-furan rings having the cis arrangement at the ring junctions, giving a V-shaped mol-ecule. An intra-molecular O-H?O inter-action occurs. Inter-molecular O-H?O hydrogen bonds help to stabilize the crystal structure.

| S-EPMC3007024 | biostudies-literature

(3S,3aS,6R,6aR)-2-Oxohexa-hydro-furo[3,2-b]furan-3,6-diyl dibenzoate.

Project description:The title compound, C20H16O7, contains a cis-fused ?-lactone tetra-hydro-furan ring system functionalized with two benzo-yloxy groups. Both rings adopt an envelope conformation. The mol-ecule assumes an elongated shape and exibits non-crystallographic C 2 symmetry. The benzo-yloxy groups are almost planar [maximum deviations of 0.0491?(15) and 0.0336?(17)?Å for the O atoms] and their mean planes are inclined to one another by 16.51?(4)°. The crystal packing features weak C-H?O inter-actions. The aryl groups of adjacent mol-ecules are parallel shifted with face-to-face contacts and a shortest inter-molecular C?C distance of 3.482?(4)?Å.

| S-EPMC3790370 | biostudies-literature

(3aR,8aS,9S,9aR)-9-Hydroxy-perhydro-furo[3,2-f]indolizin-6-one.

Project description:In the title compound, C(10)H(15)NO(3), the central six-membered ring of the indolizine system adopts a chair conformation, while the oxopyrrolidine and hydro-furan rings attached to the indolizine ring system have envelope conformations. In the crystal, the mol-ecules form chains parallel to the b axis via inter-molecular O-H?O hydrogen bonds. The absolute configuration was assigned from the synthesis.

| S-EPMC2977186 | biostudies-other

{(3aR,5S,6R,6aR)-5-[(R)-1,2-Di-hydroxy-eth-yl]-2,2-di-methyl-tetra-hydro-furo[2,3-d][1,3]dioxol-6-yl}methyl methane-sulfonate.

Project description:In the title compound, C11H20O8S, the furan-ose ring has a pseudorotation phase angle equal to 31.3° and assumes a (3) T 4 conformation, with deviations of 0.297?(4) and -0.152?(4)?Å for the corresponding C atoms. The dioxolane ring adopts an envelope conformation. One of the O atoms is at the flap and deviates from the least-squares plane formed by the other four ring atoms by 0.405?(2)?Å. The dihedral angle between the planar fragments of the rings is 63.53?(8)°. In the crystal, mol-ecules are associated into sheets perpendiculer to the b axis by means of O-H?O hydrogen bonds. A few weak C-H?O inter-actions are also observed.

| S-EPMC4011227 | biostudies-other

(3aS,7S,9aS,9bR)-3a,6,6,9a-Tetra-methyl-2-oxoperhydro-naphtho[2,1-b]furan-7-yl acetate.

Project description:THE TITLE COMPOUND (COMMON NAME: 3?-acet-oxy-8-epi-sclareolide), C(18)H(28)O(4), is a sclareolide derivative, which was synthesized from 9(11)-en-3?-acet-oxy-8-epi-sclareolide. In the mol-ecular structure, the two six-membered rings display chair conformations and the five-membered ring displays an envelope conformation. Weak inter-molecular C-H?O hydrogen bonding is present in the crystal structure.

| S-EPMC2960644 | biostudies-literature

8-Methyl-4-phenyl-2,3,3a,4,5,9b-hexa-hydro-furo[3,2-c]quinoline.

Project description:The title compound, C(18)H(19)NO, was synthesized from the multi-component one-pot reaction between p-toluidine, benzaldehyde and 2,3-dihydro-furan in the presence of palladium dichloride. There are two mol-ecules in the asymmetric unit. The crystal packing is stabilized by classical inter-molecular N-H?O hydrogen bonds.

| S-EPMC2980039 | biostudies-literature

Methyl 2-(2,2-dimethyl-3a,6a-di-hydro-furo[3,2-d][1,3]dioxol-5-yl)-4-oxo-4H-chromene-3-carboxyl-ate.

Project description:In the title mol-ecule, C18H16O7, the dioxolane ring adopts an envelope conformation with the dimethyl-substituted C atom as the flap. The furan ring is almost coplanar with the pyran ring, with a dihedral angle of 1.04?(10)° between the planes, and it makes a dihedral angle of 67.97?(11)° with the mean plane of the dioxolane ring. The latter makes a dihedral angle of 67.15?(10)° with the pyran ring. The O atom attached to the pyran ring deviates by -0.009?(1)?Å. The crystal packing features C-H?O hydrogen bonds, forming a three-dimensional structure. The meth-oxy-carbonyl atoms are disordered over two positions, with a refined occupancy ratio of 0.508?(18):0.492?(18).

| S-EPMC3793797 | biostudies-other

3-Hydr-oxy-3a,6,8c-trimethyl-perhydro-oxireno[2',3':7,8]naphtho[1,2-b]furan-7(2H)-one.

Project description:The title compound, C(15)H(22)O(4), consists of two trans-fused six-membered rings and a trans-fused five-membered ?-lactone. The ep-oxy and hydroxyl groups are ?-oriented. The cyclo-hexane rings adopt half-chair and chair conformations and the lactone ring is in an envelope conformation. The mol-ecular structure is stabilized by one O-H?O and three C-H?O intra-molecular hydrogen bonds.

| S-EPMC2977239 | biostudies-literature

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