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Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

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Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
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Preparation of Alkynes: Alkylation Reaction02:27

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Introduction
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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Electrophilic Addition to Alkynes: Halogenation02:38

Electrophilic Addition to Alkynes: Halogenation

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Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
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Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration02:40

Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration

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Introduction
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.       
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

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Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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α-Alkylation of Ketones via Enolate Ions01:10

α-Alkylation of Ketones via Enolate Ions

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Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
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New Arylalkenyl α-Pyrones from Cryptocarya densiflora.

Jie Meng1,2,3, Jun-Juan Xue4, Lei Miao1

  • 1Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, P. R. China.

Chemistry & Biodiversity
|December 16, 2024
PubMed
Summary

Four new compounds, crydensiones A-D, were isolated from Cryptocarya densiflora. These natural products showed no significant cytotoxicity against colon, lung, or breast cancer cell lines in preliminary tests.

Keywords:
Cryptocarya densifloracytotoxicityquantum chemical calculationsspectroscopic dataα‐pyrones

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Area of Science:

  • Natural Product Chemistry
  • Organic Chemistry
  • Pharmacognosy

Background:

  • Cryptocarya densiflora is a plant species known to produce bioactive compounds.
  • Arylalkenyl α-pyrones represent a class of natural products with diverse biological activities.

Purpose of the Study:

  • To isolate and characterize novel compounds from Cryptocarya densiflora.
  • To evaluate the cytotoxic potential of isolated compounds against human cancer cell lines.

Main Methods:

  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation via comprehensive spectroscopic analyses (NMR, ECD, etc.).
  • Cytotoxicity assays against HCT-116, A549, and MDA-MB-231 cell lines.

Main Results:

  • Four new arylalkenyl α-pyrones, crydensiones A-D (1-4), were identified.
  • The structures were confirmed using advanced spectroscopic and computational methods.
  • None of the isolated compounds exhibited significant cytotoxic activity.

Conclusions:

  • The study successfully identified and characterized four new natural products from Cryptocarya densiflora.
  • Crydensiones A-D do not possess significant cytotoxic effects on the tested cancer cell lines.