The optical resolution of a (f)-E,E-2,8-disubstituted-l,4,7,lO-tetraoxaspiro[5.5] undecane system was carried out by lipase-catalyzed hydrolysis of a symmetrical diester and also by monosubstitution with a chiral amine. Configurations of the new products were assigned by chemical correlations.
2- and 8- functionalized 1,4,7,10-tetraoxaspiro[5.5]undecanes. I. Synthesis of (±)-E,E and (±)-Z,E structures.
✍ Scribed by Marielle Lemaire; Georges Jeminet; Jean-Gabriel Gourcy; Gérard Dauphin
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- French
- Weight
- 559 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0040-4020
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📜 SIMILAR VOLUMES
Selective transformations of diethyl (R)-malate afforded (R)-4-hydroxymethyl-2,2-dimethyl-l,3-dioxane 7 in reasonable yield. Subsequent synthesis of (2S,6R,8S)-2,8dihydroxyethyl-1,4,7,10-tetraoxaspiro[5.5]undecane 11 was achieved using precursor 7.
3Z,6Z,9Z,12E)-Pentadecatetraenal, a common intermediate in the synthesis of methyl A l7t EPA and methyl A I9t DHA, was obtained by copper(I)-catalyzed coupling between the Grignard reagent of I, 1-diethoxy-3-butyne and (Z, E)l-bromo-5,8-undecadien-2-yne followed by semi-hydrogenation of the resultin
The first syntheses of the novel [1,2]thiaphospholo[4,5-e][1)2,4]triazine ring system, exemplified by the derivatives 3a-c have been accomplished by the action of Lawesson's reagent on the 5-arylmethyl-l,2,4-triazin-6-ones la-¢, their thiones 2a-c or the Mannich bases 4-6. The structure of these new