Gram-scale economical synthesis of trans-coniferyl alcohol and its corresponding thiol

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Hassan Amer, Vebi Mimini, Dominik Schild, Uwe Rinner, Markus Bacher, Antje Potthast, Thomas Rosenau
Förläggare: De Gruyter
Publiceringsår: 2020
Tidskrift: Holzforschung
Volym: 74
Nummer: 2
Artikelns första sida, sidnummer: 197
Artikelns sista sida, sidnummer: 202
ISSN: 1437434X 00183830


Abstrakt

Coniferyl alcohol is considered to be a potent antioxidant and a precursor of several bioactive products. In addition, it is a frequently used as a model compound in lignin chemistry. Coniferyl thiol is used analogously to study the sulfur chemistry in technical lignins. Coniferyl alcohol was synthesized in a large scale from commercially available ferulic acid by a mixed anhydride reduction method which affords high yields (84%) under very mild conditions and allows using sodium borohydride. The nucleophilic substitution of 4-O-acetylated coniferyl alcohol (3) with thioacetic acid in the presence of dimethylformamide (DMF) dineopentylacetal afforded 4-O-acetylated coniferyl thioacetate (5) in a 70% yield, which, in a 72% yield, was deprotected to the respective thiol (6). Both coniferyl alcohol and coniferyl thiol were comprehensively analytically characterized [one-dimensional (1D) and two-dimensional (2D) nuclear magnetic resonance (NMR) spectroscopy]. The presented approach renders the two model substances readily available on a gram scale and according to low-risk, environmentally compatible protocols.


Nyckelord

coniferyl alcohol, coniferyl thiol, technical lignin

Senast uppdaterad 2020-02-04 vid 06:09