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Search query: asymmetric aldol reaction
51 articles match your search "asymmetric aldol reaction"Results 1 to 10, sorted by relevance:
data reports
The title compound, which crystallizes with two molecules in the asymmetric unit, was obtained in the course of the total synthesis of curvicollides A–C and fusaequisin A. It features the relative configuration of the western aldol part of the natural products. In the crystal, molecules are linked by C—H
O hydrogen bonds.
O hydrogen bonds.
research communications
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The title molecule is built up from a ferrocene unit disubstituted by an S-protected diphenylphosphine group and by a methylvinylketone chain. In the crystal, weak C—HO and C—HS interactions build a two-dimensional network.
O and C—HS interactions build a two-dimensional network.research communicationsOpen access
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The synthesis, crystal structure and analysis of a chiral Schiff base (S)-(+)-1-(4-bromophenyl)-N-[(4-methoxyphenyl)methylidene]ethylamine ligand along with its corresponding palladium(II) complex are detailed. The crystal structures exhibit monoclinic P21 and orthorhombic P212121 symmetries, respectively. The structure of the palladium(II) complex reveals C—HO and C—HBr hydrogen-bonding interactions involving two distinct molecules within the asymmetric unit.
O and C—HBr hydrogen-bonding interactions involving two distinct molecules within the asymmetric unit.
research communications
The acetoacetate decarboxylase-like superfamily contains a subset of proteins that are predicted to be involved in secondary metabolism based on gene context. Swit_4259, a protein of unknown function, belongs to this emerging family V subset, in which the overall fold resembles prototypical acetoacetate decarboxylases, but the active-site architecture leads to a divergence in function.
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3-(3-Hydroxyphenyl)-1-(1H-pyrrol-2-yl)prop-2-en-1-one (3HPPP) crystallized as planar molecule together with half a molecule of water in the asymmetric unit in the monoclinic crystal system with space group P2/c. A Hirshfeld surface analysis for the chalcone component showed that HH (40.9%) and HC/CH (32.4%) contacts make the largest contributions to the crystal packing of 3HPPP. In the vicinity of water, the HO/OH and HC/CH contacts are the most significant, at 48.7% and 29.8%, respectively.
H (40.9%) and HC/CH (32.4%) contacts make the largest contributions to the crystal packing of 3HPPP. In the vicinity of water, the HO/OH and HC/CH contacts are the most significant, at 48.7% and 29.8%, respectively.organic compoundsOpen access
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The title compound, C28H40N2O2S2, was obtained as a minor product from an anti-aldol reaction between the corresponding N-propionylthiolactam and benzaldehyde. The asymmetric unit contains one half-molecule, which is completed by inversion symmetry. The molecule displays a nearly eclipsed conformation along the central C-C bond with a C-C-C-C- torsion angle of 20.4 (3)°.
research papers
The structures of biphenyl synthase, of biphenyl synthase complexed with benzoyl-CoA and of benzophenone synthase are compared with that of a chalcone synthase homolog. These structures reveal that benzoic acid-specific type III polyketide synthases contain distinct structural elements, including a novel pocket, which underlie their evolutionary emergence.
organic compoundsOpen access
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The title compound, C9H11NO3, was prepared by an Aldol reaction of 2,3-dihydro-1H-pyrrolizin-1-one with formaldehyde. The asymmetric unit contains six molecules. The pyrrolizine ring system in each molecule is planar, the maximum atomic deviation being 0.066 (2) Å. In the crystal structure, molecules are liked together by an extensive O—HO hydrogen-bonding network.
O hydrogen-bonding network.research papers
The crystal structure of arabinose-5-phosphate isomerase from B. fragilis NCTC 9343 in complex with an endogenous ligand, CMP-Kdo, is described. Structural and sequence comparisons suggest highly conserved functional residues in the active site that could be targeted for antibacterial drug design.
crystallization papers
α-Isopropylmalate synthase from M. tuberculosis (Rv3710), which catalyses the first committed step of leucine biosynthesis, has been expressed, purified and crystallized in a form suitable for high-resolution X-ray structural analysis.
