摘要:
The invention provides a process for producing an optically active butyric acid compound and a production intermediate therefor at high yield and high purity.The present invention provides a process for producing Compound (6), including reacting Compound (1) with optically active 2-trifluoromethanesulfonyloxybutyrolactone (2a) in the presence of a base or reacting optically active 2-hydroxybutyrolactone (2b) under Mitsunobu reaction conditions, to thereby form Compound (3); reacting Compound (3) with an alcohol and a halogenating agent, to thereby form Compound (4); dehalogenating Compound (4), to thereby form Compound (5); and de-esterifying Compound (5).
摘要:
A process for obtaining a compound (1) and an intermediate thereof in high yield and high optical yield is provided.A process for producing a compound (4), the process including reacting a compound (2) with a compound (3) in the presence of a base; and a process for producing a compound (1), the process including reacting a compound (2) with a compound (3) in the presence of a base to yield a compound (4) and then deesterifying the compound (4). wherein R represents an alkyl group having 1 to 6 carbon atoms or an aralkyl group having 7 to 8 carbon atoms.
摘要:
A process for producing an optically active 2-hydroxybutyric ester (1), characterized by including reacting an optically active 2,3-epoxybutyric ester (2) with a thiol in the presence of scandium trifluoromethanesulfonate or ytterbium trifluoromethanesulfonate, to thereby produce Compound (3), and subjecting Compound (3) to desulfurization reaction: (wherein R represents a C1 to C6 alkyl group or a C7 or C8 aralkyl group; R1 represents a C1 to C12 alkyl group or a phenyl group; and * represents S- or R-absolute configuration). The present invention provides a process for producing an optically active 2-hydroxybutyric ester at high yield and high optical purity.
摘要:
The present invention provides a production intermediate for compound (A-1) and a method for producing the intermediate at high yield and high optical yield.
摘要:
A process for producing an optically active 2-hydroxybutyric ester (1), characterized by including reacting an optically active 2,3-epoxybutyric ester (2) with a thiol in the presence of scandium trifluoromethanesulfonate or ytterbium trifluoromethanesulfonate, to thereby produce Compound (3), and subjecting Compound (3) to desulfurization reaction: (wherein R represents a C1 to C6 alkyl group or a C7 or C8 aralkyl group; R1 represents a C1 to C12 alkyl group or a phenyl group; and * represents S- or R-absolute configuration).The present invention provides a process for producing an optically active 2-hydroxybutyric ester at high yield and high optical purity.
摘要:
A process for obtaining a compound (1) and an intermediate thereof in high yield and high optical yield is provided.A process for producing a compound (4), the process including reacting a compound (2) with a compound (3) in the presence of a base; and a process for producing a compound (1), the process including reacting a compound (2) with a compound (3) in the presence of a base to yield a compound (4) and then deesterifying the compound (4). wherein R represents an alkyl group having 1 to 6 carbon atoms or an aralkyl group having 7 to 8 carbon atoms.
摘要:
The present invention provides a production intermediate for compound (A-1) and a method for producing the intermediate at high yield and high optical yield.The present invention provides a method for producing compound (3) characterized in that compound (1) is reacted with compound (2) in the presence of a base. (wherein R represents a C1 to C6 alkyl group or a C7 to C8 aralkyl group).
摘要:
The invention provides a process for producing an optically active butyric acid compound and a production intermediate therefore at high yield and high purity.The present invention provides a process for producing Compound (6), including reacting Compound (1) with optically active 2-trifluoromethanesulfonyloxybutyrolactone (2a) in the presence of a base or reacting optically active 2-hydroxybutyrolactone (2b) under Mitsunobu reaction conditions, to thereby form Compound (3); reacting Compound (3) with an alcohol and a halogenating agent, to thereby form Compound (4); dehalogenating Compound (4), to thereby form Compound (5); and de-esterifying Compound (5).
摘要:
A process for producing an optically active 2-hydroxybutyric ester represented by formula (1): by reacting an optically active 2,3-epoxypropionic ester represented by formula (2): with a methyl Grignard reagent CH3MgX in the presence of a copper catalyst in an amount of 0.05 to 0.5 mol with respect to 1 mol of the 2,3-epoxypropionic ester.
摘要:
To provide a process for producing an optically active 2-hydroxybutyric ester at high yield and high optical purity.The process for producing an optically active 2-hydroxybutyric ester (1), characterized in that the process includes reacting an optically active 2,3-epoxypropionic ester (2) with a methyl Grignard reagent CH3MgX (wherein X represents a halogen atom) in the presence of a copper catalyst in an amount of 0.05 to 0.5 mol with respect to 1 mol of (2) through the following scheme: (wherein R represents a C1 to C6 alkyl group or a C7 or C8 aralkyl group; X represents a halogen atom; and * represents S- or R-absolute configuration).