A novel synthetic route to spirocyclic thiazolidinediones is reported by utilizing ring-closing metathesis (RCM). A selective cross metathesis (CM) of N-allyl azaspiro derivatives with different olefins has been demonstrated to prepare substituted azaspiro-[4.4]nonenediones. The X-ray crystal structure of a spirocyclic thiazolidinedione dimer is described, which has been prepared in two steps f...

The first total synthesis of the paracaseolide A, a very unusual tetraquinane oxa-cage bislactone recently isolated from the mangrove Sonneratia paracaseolaris, has been achieved. The final step and culmination of the eight-step synthetic sequence is a [4 + 2] dimerization of a 4-hydroxybutenolide, generated by singlet oxygen-mediated oxidation of a furan precursor.

Trends in concentration and loads of acetochlor, alachlor, and metolachlor and their ethanasulfonic (ESA) and oxanilic (OXA) acid degradates were studied from 1996 through 2006 in the main stem of the Iowa River, Iowa and in the South Fork Iowa River, a small tributary near the headwaters of the Iowa River. Concentration trends were determined using the parametric regression model SEAWAVE-Q, wh...

In the title compound, C19H22FN3OS, the dihedral angle between the inclined oxa-diazole and benzene rings is 52.7 (3)°. In the crystal, helical supra-molecular chains along [100] are sustained by N-H⋯S hydrogen bonds supported by methyl-ene-benzene C-H⋯π inter-actions. The crystal studied was an inversion twin with the fractional contribution of the minor component being 0.33 (14).

Objective. To evaluate the efficacy of infliximab (IFX) monotherapy versus infliximab-azathioprine sequential treatment in Crohn's disease (CD) patients. Methods. Patients newly diagnosed with CD using IFX as induction therapy were enrolled. After 6 times of IFX infusions, they were divided into IFX monotherapy group and IFX-AZA sequential therapy group. Clinical remission rates were assessed a...

The 1,2-aminoindanol scaffold has been found to be very efficient, enhancing the enantioselectivity when present in organocatalysts. This may be explained by its ability to induce a bifunctional activation of the substrates involved in the reaction. Thus, it is easy to find hydrogen-bonding organocatalysts ((thio)ureas, squaramides, quinolinium thioamide, etc.) in the literature containing this...

In the two independent mol-ecules in the asymmetric unit of the title compound, C(13)H(9)N(3)O(2)S, the aza-tricyclo-trideca-penta-ene ring system is approximately planar with r.m.s. deviations of 0.022 and 0.033 Å. The urea unit connected to the fused rings is approximately perpendicular [dihedral angles = 82.4 (1) and 82.7 (1)°]. In the crystal, the mol-ecules associate by N-H⋯O hydrogen bond...

In the title mol-ecule, C24H22N4O3, the plane of the oxa-diazole ring forms a dihedral angle of 32.41 (12)° with that of the phenyl ring and dihedral angles of 74.51 (10) and 56.38 (10)° with the planes of the benzene rings. In the crystal, pairs of N-H⋯N hydrogen bonds link molecules into inversion dimers featuring R 2 (2)(8) graph-set motifs.

In the title compound, C18H21F3N4O4, the piperazine ring adopts a chair conformation and the dihedral angle between the oxa-diazole and benzene rings is 6.45 (14)°. The C atoms and their attached H atoms in the piperazine ring are disordered, with site-occupation factors of 0.576 (12) and 0.424 (12). In the crystal, mol-ecules are linked through weak C-H⋯O inter-actions, generating an R 2 (2)(1...

In the title mol-ecule, C18H19BrN2O, the benzene ring is inclined to the oxa-diazole ring by 10.44 (8)°. In the crystal, C-H⋯π inter-actions link the mol-ecules in a head-to-tail fashion, forming chains extending along the c-axis direction. The chains are further connected by π-π stacking inter-actions, with centroid-centroid distances of 3.6385 (7) Å, forming layers parallel to the bc plane.