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¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

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Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
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Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

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Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
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Prochirality02:05

Prochirality

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Pseudoprolines as stereoelectronically tunable proline isosteres.

R Kashif Khan1, Nicholas A Meanwell2, Harry H Hager3

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Pseudoprolines, proline isosteres with heteroatoms, offer unique ways to modify peptide structures. These versatile molecules show promise for drug discovery and optimizing small molecule designs.

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Area of Science:

  • Medicinal Chemistry
  • Organic Chemistry
  • Biochemistry

Background:

  • Proline (Pro) is a natural amino acid with a cyclic structure that imparts unique conformational properties, influencing polypeptide structure and function.
  • Pseudoprolines are proline isosteres where a heteroatom (O, S, Si, Se) replaces a carbon in the pyrrolidine ring.
  • These modifications allow for facile molecular editing, influencing amide bond topology and ring pucker.

Purpose of the Study:

  • To summarize the physicochemical properties of pseudoprolines.
  • To illustrate the potential applications of pseudoprolines in drug discovery.
  • To survey examples of pseudoproline use in designing bioactive molecules.

Main Methods:

  • Review of pseudoproline synthesis and properties.
  • Analysis of pseudoproline incorporation into oligopeptide analogues.
  • Survey of pseudoproline applications in small molecule drug design.

Main Results:

  • Pseudoprolines offer tunable physicochemical properties through heteroatom incorporation.
  • They enable precise modulation of dipeptide amide bond topology and ring conformation.
  • Pseudoprolines have been successfully applied in the design of various bioactive molecules.

Conclusions:

  • Pseudoprolines are versatile building blocks with significant potential in medicinal chemistry.
  • Their unique structural and conformational properties can be leveraged for drug discovery and optimization.
  • Further exploration of pseudoprolines could lead to novel therapeutic agents.