Hydroxynitrile lyase catalysed synthesis of heterocyclic (R)- and (S)-cyanohydrins
作者:Manuela Avi、Martin H. Fechter、Karl Gruber、Ferdinand Belaj、Peter Pöchlauer、Herfried Griengl
DOI:10.1016/j.tet.2004.07.099
日期:2004.11
saturated five- and six-membered ring ketones sometimes bearing a methyl substituent were reacted with HCN under enzyme catalysis using recombinant hydroxynitrile lyase from Hevea brasiliensis, as a rule (S)-selective, and Prunus amygdalus, (R)-selective. The resulting cyanohydrins were stereochemically characterised. The steric outcome of these transformations was interpreted by molecular modelling.
SYNTHESIS OF AZULENO[1,2-<i>b</i>]- AND AZULENO[1,2-<i>c</i>]THIOPHENES BY THE REACTIONS OF 2<i>H</i>-CYCLOHEPTA[<i>b</i>]FURAN-2-ONES WITH ENAMINES OF 3-OXOTETRAHYDROTHIOPHENES
New heterocyclic compounds, azuleno[1,2-b]- and azuleno[1,2-c]thiophene, are synthesized by the reaction of 3-methoxycarbonyl-2H-cyclohepta[b]furan-2-one with morpholino enamines of 3-oxotetrahydrothiophene, followed by dehydrogenation of resulting dihydrocompounds with 2,3-dichloro-5,6-dicyano-p-benzoquinone.
Furo-, Pyrano- und Oxepino-chinoline sowie deren Schwefel-Analoga
作者:G. Kempter、P. Zänker、H.-D. Zürner
DOI:10.1002/ardp.19673001005
日期:——
Aus aromatischen o‐Amino‐ketonen und heterocyclischen Ringketonen, die in 3‐ bzw. 4‐Stellung zur Carbonylgruppe Sauerstoff bzw. Schwefel enthalten, werden heterocyclisch b‐kondensierte Chinoline hergestellt.
由芳香族邻氨基酮和杂环酮(其 3 位或 4 位含有氧和硫)到羰基,生成杂环 b-稠合喹啉。
Certain lower alkyl 4,5-dihydrothiophene-3-thiols
申请人:Lever Brothers Company
公开号:US04020170A1
公开(公告)日:1977-04-26
Novel sulphur containing food flavor substances are provided containing an oxygen or sulphur atom in a five or six membered ring structure, one alkyl or hydroxy alkyl substituent at at least either of the carbon atoms adjacent to the hetero atom and having at least one sulphur or oxygen atom attached to another carbon atom of the ring structure.
Monomethylierte 3-Thiacyclopentylsulfaminsäuren und ihre Süßstoffeigenschaften
作者:B. Unterhalt、L. Kerckhoff、M. Möllers
DOI:10.3797/scipharm.aut-00-09
日期:——
Methyl-3-thiacyclopentanarnines 4a-c were reacted to their sulfamic acid sodiurn salts 5a-c, and their structures determined.Only sodium 4-methyl-3-thiacyclopentylsulfamate (5b) is sweet. The oxa analogues 8a-b however are tasteless.