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2 article(s) from Kristensen, Tor E

Chemoselective O-acylation of hydroxyamino acids and amino alcohols under acidic reaction conditions: History, scope and applications

Tor E. Kristensen

Beilstein J. Org. Chem. 2015, 11, 446–468, doi:10.3762/bjoc.11.51

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Scheme 1: Selective O-acetylation of hydroxyamino acids with acetic anhydride in perchloric acid-acetic acid ...

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Scheme 2: Selective O-acetylation of L-tyrosine as reported by Bretschneider and Biemann in 1950 [13].

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Scheme 3: Selective O-acetylation of L-serine in acetic acid saturated with hydrogen chloride as reported by ...

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Scheme 4: Chemoselective O-acetylation of hydroxyamino acids with acetyl chloride in hydrochloric acid–acetic...

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Scheme 5: Chemoselective O-acylation of hydroxyamino acids with acyl chlorides in anhydrous trifluoroacetic a...

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Scheme 6: Chemoselective O-acylation of hydroxyproline with acyl chlorides or carboxylic anhydrides in methan...

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Scheme 7: Chemoselective O-acetylation of L-DOPA as reported by Fuller, Verlander and Goodman in 1978 [35].

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Scheme 8: Chemoselective O-acylation of L-tyrosine as reported by Huang, Kimura, Bawarshi-Nassar and Hussain ...

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Scheme 9: Preparation of proline amphiphiles or acrylic proline monomers (for macromolecular synthesis) by ch...

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Scheme 10: Preparation of amphiphilic organocatalysts from serine, threonine and cysteine by chemoselective O-...

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Scheme 11: Preparation of amphiphilic proline organocatalysts by chemoselective O-acylation with acyl chloride...

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Scheme 12: Amphiphilic organocatalysts prepared from hydroxyamino acids and isosteviol by chemoselective O-acy...

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Scheme 13: Preparation of acrylic proline precursors for polymeric organocatalysts by chemoselective O-acylati...

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Scheme 14: Conversion of trans-4-hydroxy-L-proline to cis-4-hydroxy-D-proline·HCl and subsequent chemoselectiv...

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Scheme 15: Some examples of chemoselective O-acylation of amino alcohols under acidic reaction conditions repo...

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Scheme 16: An assembly of chiral acrylic building blocks useful in the synthesis of polymer-supported diphenyl...

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Scheme 17: The chemoselective pentaacetylation of D-glucamine under acidic reaction conditions [95].

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Album

Review

Published 08 Apr 2015

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Combined bead polymerization and Cinchona organocatalyst immobilization by thiol–ene addition

Kim A. Fredriksen,
Tor E. Kristensen and
Tore Hansen

Beilstein J. Org. Chem. 2012, 8, 1126–1133, doi:10.3762/bjoc.8.125

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Figure 1: Thiol, alkene and organocatalyst building blocks for combined bead polymerization and Cinchona orga...

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Scheme 1: Combined bead polymerization and Cinchona organocatalyst immobilization by thiol–ene addition.

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Album

Letter

Published 20 Jul 2012

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