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Factors Affecting α-Alkylation of Ketones: Choice of Base01:10

Factors Affecting α-Alkylation of Ketones: Choice of Base

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α-Alkylation of ketones is achieved in the presence of alkyl halides and a base. The reaction proceeds via the formation of an enolate ion followed by nucleophilic substitution. The choice of base employed is essential as it is the key factor in determining the reaction outcome.
The reaction involving bases like EtO− whose conjugate acid EtOH (pKa = 15.9) is stronger than the ketone (pKa = 19.2) results in an equilibrium mixture with higher ketone concentration. As a consequence,...
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The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.
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Alkyl Halides02:45

Alkyl Halides

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Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
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Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.
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Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Mass Spectrometry: Alkyl Halide Fragmentation01:22

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Chlorine isotopes exist as 35Cl and 37Cl in a 3:1 ratio, while bromine isotopes exist as 79Br and 81Br in a 1:1 ratio. The mass spectrum of alkyl halides typically produces two distinct molecular ion peaks, the molecular ion peak, [M], and the molecular ion plus two, [M + 2] peak. The relative heights of these two peaks are proportional to the isotopic abundance ratios of the halide. For example, 2‐chloropropane and 1‐bromopropane display two peaks with relative peak heights in a 3:1 and...
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Aryl sulfonate based anticancer alkylating agents.

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Researchers synthesized novel antineoplastic alkylating sulfonate esters with dual alkylating sites for DNA crosslinking. Aryl sulfonate leaving groups and electron-withdrawing substituents enhanced reactivity for optimized antineoplastic drug development.

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Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Molecular Biology

Background:

  • Antineoplastic alkylating agents are crucial in cancer therapy.
  • DNA crosslinking agents offer a mechanism for inhibiting cancer cell proliferation.
  • Developing novel agents with enhanced reactivity and specificity is an ongoing challenge.

Purpose of the Study:

  • To synthesize novel antineoplastic alkylating sulfonate esters with dual alkylating sites.
  • To evaluate their potential as DNA crosslinking agents.
  • To investigate the relationship between molecular structure and reactivity.

Main Methods:

  • Synthesis of dual alkylating sulfonate esters.
  • Reaction of synthesized molecules with guanosine nucleoside.
  • Monitoring synthesis and crosslinking using MALDI-TOF mass spectrometry.
  • Comparison of adduct formation rates with busulfan.

Main Results:

  • Successful synthesis of dual alkylating sulfonate esters.
  • Demonstrated crosslinking of guanosine nucleoside.
  • Aryl sulfonate leaving groups increased the rate of nucleophilic attack.
  • Reactivity correlated with the electronic nature of aryl ring substituents, with electron-withdrawing groups enhancing reaction rates.

Conclusions:

  • Novel antineoplastic alkylating agents with dual alkylating sites were synthesized.
  • Aryl sulfonate leaving groups and electron-withdrawing substituents optimize reactivity for DNA crosslinking.
  • These findings pave the way for developing more effective antineoplastic therapies.