C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 49/297 (2006.01) C07C 29/40 (2006.01) C07C 35/18 (2006.01) C07C 43/188 (2006.01) C07C 45/58 (2006.01) C07C 45/67 (2006.01) C07C 49/337 (2006.01) C07C 69/03 (2006.01) C07C 69/78 (2006.01) C07C 69/96 (2006.01) C07D 303/14 (2006.01) C07D 303/16 (2006.01) C07D 303/22 (2006.01) C07D 303/31 (2006.01) C07D 309/12 (2006.01) C07D 407/12 (2006.01) C07F 7/18 (2006.01)
Patent
CA 2143992
A process for preparing 4-hydroxy-1,2,2-trimethylcyclopentyl methyl ketones of the general formula I, in particular of the (1R,4S)-4-hydroxy-1,2,2-trimethylcyclopentyl methyl ketone of the formula Ia Image Image (I), (Ia) which is required for preparing the red dye capsorubin which is in demand, starts from 2,2,6-trimethylcyclohexanones of the gen- eral formula II Image (II), where R is hydrogen or a protective group, via the novel intermediates of the general formulae V and VI Image Image (V) (VI), by diastereoselective epoxidation and reaction of the resulting 7-oxabicyclo[4.1.0]heptanes of the general formula VIII Image (VIII) (R=H or protective group) with Lewis acids and, where appropriate, removal of the protec- tive group. Also claimed are the novel intermediates of the for- mula V and their (1S) and (1R) isomers and those of the formula VIII as well as their (1R,3S,6S), (1S,3S,6R) and (1R,3R,6S) isomers.
John Michael
Meyer Joachim
Paust Joachim
Rheude Udo
Basf Aktiengesellschaft
Robic
LandOfFree
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