A 4-fluorobiphenyl derivative of formula (I), which is useful as a cholesterol lowering agent or a lipid lowering agent because of its strong inhibitory effect on HMG-CoA reductase), and which is also useful as an intermediate for producing the above-mentioned cholesterol lowering agent or lipid lowering agent: ##STR1## wherein A is a .omega.-oxycarbonyldihydroxybutyl group, a tetrahydropyranyl group, a .omega.-oxycarbonyl-3-oxobutyl group, a formyl group, or a cyano group; R.sup.1 is a halogen atom, an alkyl group, or a group represented by R.sup.5 O--, wherein R.sup.5 is a hydrogen atom, or an alkyl group; R.sup.2 is a hydrogen atom, an alkyl group; R.sup.3 is a hydrogen atom, or an alkyl group; R.sup.5 and R.sup.2 may form a five-membered ring or a six-membered ring in combination with the oxygen atoms to which R.sup.5 and R.sup.2 are respectively bonded, and R.sup.5 and R.sup.3 may form a five-membered ring or a six-membered ring in combination with the oxygen atom to which R.sup.5 is bonded.
A 4-fluorobiphenyl derivative of formula (I), which is useful as a cholesterol lowering agent or a lipid lowering agent because of its strong inhibitory effect on HMG-CoA reductase), and which is also useful as an intermediate for producing the above-mentioned cholesterol lowering agent or lipid lowering agent:
wherein A is a ω-oxycarbonyldihydroxybutyl group, a tetrahydropyranyl group, a ω-oxycarbonyl-3-oxobutyl group, a formyl group, or a cyano group; R¹ is a halogen atom, an alkyl group, or a group represented by R⁵O-, wherein R⁵ is a hydrogen atom, or an alkyl group; R² is a hydrogen atom, an alkyl group; R³ is a hydrogen atom, or an alkyl group; R⁵ and R² may form a five-membered ring or a six-membered ring in combination with the oxygen atoms to which R⁵ and R² are respectively bonded, and R⁵ and R³ may form a five-membered ring or a six-membered ring in combination with the oxygen atom to which R⁵ is bonded.
Methods of producing carboxylic acid ester derivatives and intermediates for use in the methods
申请人:FUJIREBIO Inc.
公开号:EP0643054A2
公开(公告)日:1995-03-15
Methods of producing carboxylic acid ester derivatives of formulae (I) and (II), which are useful, for instance, as intermediates for producing an anti-hypercholesterolemic agent having an inhibitory effect on HMG-CoA Reductase:
wherein R1 and R2 are independently a protective group for hydroxyl group, or R1 and R2 integrally constitute a protective group for hydroxyl groups; R3 is an alkyl group, or an aryl group; and R4 is a substituted aryl group, a substituted heterocyclic group, a substituted vinyl group, or a substituted cycloalkenyl group; and
wherein R1, R2, R3 and R4 are respectively the same as defined in the above formula (I), are disclosed. In addition, intermediates for use in these methods of producing the carboxylic acid ester derivatives are disclosed.