Synthesis of 4-aminotropones through a cyclization-ring expansion process occurs in a single step and with excellent yields from 4-amino-2,5-cyclohexadienones (p-quinamines) bearing a 4-sulfinyl or sulfonyl methyl group.

The title compound, C(21)H(21)N(5)O(2), is a 1,4-dimethyl-1,2,3-triazole having dimethyl-benzodiazepindione and phenyl substituents on each methyl group; the substituents are positioned on opposite sides of the five-membered ring. The seven-membered fused-ring of the larger substituent adopts a boat-shaped conformation (with the methine C atom as the prow).

In the title compound, C(10)H(9)NOS(2), the dihedral angle between the rhodanine (2-thioxo-1,3-thia-zolidin-4-one) and 3-methyl-phenyl rings is 83.30 (3)°. The H atoms of the methyl group are disordered over two set of sites with an occupancy ratio of 0.58 (3):0.42 (3). In the crystal, the mol-ecules inter-act by way of C-H⋯π and C=O⋯π inter-actions.

In the title compound, C(16)H(11)FO(4)S, the O atom and the methyl group of the methyl-sulfinyl substituent are located on opposite sides of the mean plane through the 5,6-(methyl-enedi-oxy)benzofuran fragment. The 4-fluoro-phenyl ring is rotated out of the 5,6-(methyl-enedi-oxy)benzofuran plane, making a dihedral angle of 29.90 (6)°. In the crystal structure, both inter-molecular C-H⋯O hydroge...

The title mol-ecule, C(60)H(70)N(2)O(4)Si(8), lies on an inversion center. In the asymmetric unit, one of the phenyl rings is disordered over two sets of sites with refined occupancies 0.58 (2) and 0.42 (2). In addition, in two substitution sites of the terminal dimeth-yl(vin-yl)silyl unit, a methyl group and the vinyl group are disordered over the same site with refined occupancies 0.523 (13) ...

In the structure of the title compound, C(14)H(12)ClNO, the conformations of the N-H and C=O bonds are anti to each other. Furthermore, the conformation of the C=O bond is syn to the meta-methyl group in the benzoyl ring. The central -NH-C(=O)- amido group makes a dihedral angle of 32.4 (1)° with the benzoyl ring and 36.1 (1)° with the anilino ring. The dihedral angle between the two benzene ri...

The triphenyl-methyl group in the title compound, C(28)H(23)IO(2)S, has the methine carbon slightly flattened out [ΣC(phen-yl)-C-C(phen-yl) = 332.8 (6) °]. The -C-O-C-C-S- chain connecting the triphenyl-methyl group and the aromatic ring adopts an extended zigzag conformation, these five atoms being approximately co-planar (r.m.s. deviation 0.260 Å).

The influence of hydration on the nanosecond timescale dynamics of tRNA is investigated using neutron scattering spectroscopy. Unlike protein dynamics, the dynamics of tRNA is not affected by methyl group rotation. This allows for a simpler analysis of the influence of hydration on the conformational motions in RNA. We find that hydration affects the dynamics of tRNA significantly more than tha...

There are about fifty SET domain protein methyltransferases (PMTs) in the human genome, that transfer a methyl group from S-adenosyl-L-methionine (SAM) to substrate lysines on histone tails or other peptides. A number of structures in complex with cofactor, substrate, or inhibitors revealed the mechanisms of substrate recognition, methylation state specificity, and chemical inhibition. Based on...

The palladium catalytic system was first applied to 2-arylquinazoline synthesis via hydrogen transfer methodology. Various (E)-2-nitrobenzaldehyde O-methyl oximes reacted easily with alcohols or benzyl amines to provide N-heterocyclic compounds in good to high yields. Similarly, the heterocyclic products could be prepared by the reaction of 1-(2-nitrophenyl)ethanone, urea and benzyl alcohols. I...