Unique catalysis of gold nanoparticles in the chemoselective hydrogenolysis with H2: cooperative effect between small gold nanoparticles and a basic support
Enantioselective Bio‐Hydrolysis of Geranyl‐Derived rac‐Epoxides: A Chemoenzymatic Route to trans‐Furanoid Linalool Oxide
作者:Matthijs van Lint、Aysegül Gümüs、Eelco Ruijter、Kurt Faber、Romano Orru、Mélanie Hall
DOI:10.1002/adsc.201801094
日期:——
many chemical dihydroxylation methods, enzymatic epoxidehydrolysis provides an environmentally benign route to vicinaldiols, which are important intermediates in the synthesis of fine chemicals and pharmaceuticals. Usingepoxidehydrolases, enantiopurediols are accessible under mild conditions. In order to assess the selectivity of epoxidehydrolases on geraniol‐derived oxiranes, a range of derivatives
Asymmetric synthesis of γ-chiral borylalkanes <i>via</i> sequential reduction/hydroboration using a single copper catalyst
作者:Jung Tae Han、Jin Yong Lee、Jaesook Yun
DOI:10.1039/d0sc03759a
日期:——
The synthesis of γ-chiral borylalkanes through copper-catalyzedenantioselective SN2′-reduction of γ,γ-disubstituted allylic substrates and subsequent hydroboration was reported. A copper–DTBM-Segphos catalyst produced a range of γ-chiral alkylboronates from easily accessible allylic acetate or benzoate with high enantioselectivities up to 99% ee. Furthermore, selective organic transformations of the
asymmetric allylic substitution cascade reaction, using α-(pyridin-1-yl)-acetamides (formed in situ) as nucleophiles, has been developed, generating chiral piperidine-containing aminoacid derivatives via a one-pot procedure in high yields and with up to 96% ee. The products can be easily converted into potential bioactive compounds, unnatural chiralaminoacids and dipeptides.
The present invention refers to 3,7-dimethyloct-6-en-1-yl methyl carbonate and its use as fragrance ingredient. The invention further refers to fragrance compositions and fragranced articles comprising it.