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C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
C07D311/42—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4
C07D311/44—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4 with one hydrogen atom in position 3
C07D311/46—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4 with one hydrogen atom in position 3 unsubstituted in the carbocyclic ring
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Procede pour la preparation d'esters d'acide acetique substitue optiquement actif et d'alcool benzylique substitue racemique ou optiquement actif, et esters d'acide acetique substitue levogyre et d'alcool benzylique substitue racemique ou optiquement actif,
Nouveaux dérivés substitués de l'acide 3-formyl 4-méthyl pentanoique, leur préparation et leur application à la préparation d'acide 3-formyl but-3-èn-1-oique substitué