Articles with "intramolecular cycloaddition" as a keyword



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NHC–Au(I) catalyzed enantioselective intramolecular [4+3] cycloaddition of furan propargyl esters

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Published in 2019 at "Journal of Organometallic Chemistry"

DOI: 10.1016/j.jorganchem.2019.07.016

Abstract: Abstract Enantioselectivity up to 75% ee has been achieved for an intramolecular [4 + 3] cycloaddition reaction with a series of chiral gold(I) complexes. Nine new chiral NHC–Au(I) complexes featuring disilylbiphenyl derived chiral N-heterocyclic carbene ligands were… read more here.

Keywords: single crystal; cycloaddition; crystal structure; ray single ... See more keywords
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“Metal –free” synthesis of 1,2,3-triazoles via tandem azidation, intramolecular [3+2]-cycloaddition and aromatization of ethyl acrylate derivatives

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Published in 2018 at "Tetrahedron Letters"

DOI: 10.1016/j.tetlet.2018.05.020

Abstract: Abstract An efficient “one-pot” method for the synthesis of substituted 1,2,3-triazole derivatives in excellent yields as single regioisomer is reported. The key transformation involves an atom-efficient tandem azidation, intramolecular [3+2]-cycloaddition and aromatization of acrylate derivatives… read more here.

Keywords: azidation intramolecular; tandem azidation; cycloaddition aromatization; acrylate derivatives ... See more keywords
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Steric- and Electronic-Controlled Intramolecular [2 + 2]-Cycloaddition of Cyclohexadienone-Containing 1,7-Enynes.

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Published in 2022 at "Organic letters"

DOI: 10.1021/acs.orglett.1c04232

Abstract: Herein we have developed the silver-catalyzed electronic- and steric-controlled intramolecular formal [2 + 2]-cycloaddition of alkyne-tethered cyclohexadienones. Substrates with electron-rich alkynes and a less hindered quaternary carbon center afford tricyclic fused cyclobutenes through 1,7-enyne cyclization.… read more here.

Keywords: controlled intramolecular; electronic controlled; intramolecular cycloaddition; steric electronic ... See more keywords
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Dearomatization of Indole via Intramolecular [3 + 2] Cycloaddition: Access to the Pentacyclic Skeleton of Strychons Alkaloids.

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Published in 2018 at "Organic letters"

DOI: 10.1021/acs.orglett.8b01720

Abstract: An efficient method to build various multisubstituted polycyclic indoline-annulated normal to medium-size rings through dearomatization of indole via a tandem 1,2-acyloxy migration/intramolecular [3 + 2] cycloaddition process is described. The pentacyclic skeleton of strychnine could… read more here.

Keywords: cycloaddition; indole via; intramolecular cycloaddition; dearomatization indole ... See more keywords
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An Intramolecular Cycloaddition Approach to the Kauranoid Family of Diterpene Metabolites.

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Published in 2019 at "Organic letters"

DOI: 10.1021/acs.orglett.8b03810

Abstract: Synthetic studies toward the ent-kauranoid family of diterpene natural products are reported. An intramolecular (4 + 3) cycloaddition allows the direct elaboration of diverse natural product frameworks, encompassing a challenging bicyclo[3.2.1]octane core. The established routes… read more here.

Keywords: intramolecular cycloaddition; cycloaddition approach; kauranoid family; family diterpene ... See more keywords
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Rh(i)-Catalyzed intramolecular [2 + 2 + 1] cycloaddition of diynes with the N-terminal of the diazo group

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Published in 2019 at "Organic Chemistry Frontiers"

DOI: 10.1039/c9qo00403c

Abstract: A Rh(i) catalyzed [2 + 2 + 1] cycloaddition of intramolecular diynes and a diazo moiety has been reported, in which the dediazoniation does not occur and the terminal nitrogen of the diazo moiety serves… read more here.

Keywords: diynes terminal; diazo; cycloaddition; catalyzed intramolecular ... See more keywords
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Rh(I)-Catalyzed Intramolecular [3+2] Cycloaddition of trans-2-­Allene-Vinylcyclopropanes

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Published in 2018 at "Synlett"

DOI: 10.1055/s-0037-1609199

Abstract: An intramolecular [3+2] cycloaddition of trans -2-allene-­vinylcyclopropanes for the synthesis of bicyclo[3.3.0]octane derivatives is developed. read more here.

Keywords: trans allene; allene vinylcyclopropanes; intramolecular cycloaddition; cycloaddition trans ... See more keywords

Regioselectivity and Reactivity of Intramolecular [2+2] Cycloaddition Reactions of Acyl Ketenes: Experimental and Theoretical Studies

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Published in 2018 at "Synlett"

DOI: 10.1055/s-0037-1610198

Abstract: The regioselectivity of the intramolecular [2+2] cycloaddition reaction of acyl ketenes formed from metastable mesoionic 1,3-oxazinium-4-olates was investigated by experimental and theoretical methods. The ring opening of the mesoionic N -allyl-2-(2-arylvinyl)-1,3-oxazinium-4-olates led to the formation… read more here.

Keywords: cycloaddition; acyl ketenes; intramolecular cycloaddition; reaction ... See more keywords
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Inter- and Intramolecular Cycloaddition Reactions of Ethenetricarboxylates with Styrenes and Halostyrenes

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Published in 2020 at "Synthesis"

DOI: 10.1055/s-0040-1706547

Abstract: Inter- and intramolecular cycloaddition reactions of ethenetricarboxylates with styrenes and α-halostyrenes have been investigated. The reactions of ethenetricarboxylates with styrenes or α-bromostyrenes in the presence of SnCl4 or SnBr4 stereoselectively gave 2,4-cis-substituted cyclobutanes. The intramolecular… read more here.

Keywords: cycloaddition reactions; intramolecular cycloaddition; ethenetricarboxylates styrenes; reactions ethenetricarboxylates ... See more keywords