169 research outputs found
Removal of C-ring from the CD-ring skeleton of 1 alpha,25-dihydroxyvitamin D-3 does not alter its target tissue metabolism significantly
Get PDFEnantioselective synthesis of pseudosugars of the allo-, gulo-, manno- and talo-series
No full text(1R,2S,3R,4S)-4-Butyryloxy-2,3-isopropylidenedioxy-cyclohexen-5-en-1-ol (1) is the common chiral building block for the 8 title pseudosugars. The hydroxymethyl substituent is introduced either via a radical reaction or via 2,3-Wittig rearrangement
The monomethylethers of isoamylphloroglucinol and the structure of xanthohumol
No full textThe two isomeric monomethylethers of isoamylphloroglucinol have been prepared. The 4-methylether is identical with the reduced degradation compound of xanthohumol. This solves the structure of xanthohumol which is concordant with the other known natural chalkones
A new and facile hydroazulene formation : evidence for the thermal oxygen to oxygen migration of a trimethylsilyl group
No full textThermolysis of the 2,5-bis(trimethylsiloxy)-tricyclo[4.4.0.0(2,5)]decan-7-ones 3 and 16 leads to hydroazulenes by a transannular reaction involving a remarkable oxygen to oxygen migration of a silylgroup in the intermediate cyclodecadienones
Asymmetric alkylation of alfa-aryl substituted carbonyl compounds by means of chiral phase transfer catalysts applications for the synthesis of (+)-podocarp-8 (14)-en-13-one and of (-)-wy-16,225, a potent analgestic agent
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