摘要:
The present invention has for its object to provide an efficient and economical method for producing an 3-amino-2-hydroxy-1-propanol derivative and an oxazolidinone derivative derived therefrom, both of which are of use as intermediates for the production of drugs including HIV protease inhibitors. The invention relates to a method for producing an 3-amino-2-hydroxy-1-propanol derivative of general formula (2) ##STR1## (wherein R.sup.1 represents alkyl, aralkyl or aryl; R.sup.2 and R.sup.3 independently represent hydrogen or an amino-protecting group, provided, however, that both R.sup.2 and R.sup.3 are not concurrently hydrogen) and an oxazolidinone derivative derived therefrom.
摘要:
The present invention has its object to provide a process for producing azetidine-2-carboxylic acid and an intermediate thereof, which is efficient and economical and suited for industrial practice.The present invention is related to a process for producing azetidine-2-carboxylic acid of the following formula (5), which comprises subjecting a 4-oxo-2-azetidinecarboxylic acid derivative represented by the general formula (1) to hydride reduction to give azetidine-2-methanol of the following formula (2), treating the same with an amino-protecting agent to give N-protected azetidine-2-methanol represented by the following general formula (3), treating this with an oxidizing agent to give N-protected azetidine-2-carboxylic acid represented by the following general formula (4) and, further, subjecting the amino-protecting group thereof to elimination.
摘要:
An N.sup.2 -(1-substituted-3-phenylpropyl)-L-lysine derivative is disclosed and is represented by formula (I) ##STR1## wherein R.sup.1 represents an acyl type or urethane type protective group; R.sup.2 represents a hydrogen atom, an alkyl group, or an aralkyl group. X represents a cyano (CN) group or an aminocarbonyl (CONH.sub.2) group; and the mark * represents the (S) position to the asymmetric carbon atom.
摘要:
A malonic monoester is prepared in a good yield by a single step reaction by reacting malonic acid with an alcohol in the presence of a base and an activator of malonic acid selected from the group consisting of an acyl halide or halocarbonate and an acid anhydride or dicarbonate.
摘要:
The present invention presents a method for preparation of S-3,4-dihydroxy butyronitrile expressed by the structural formula (II) ##STR1## characterized by causing R-3-chloro-1,2-propanediol expressed by the structural formula (I) ##STR2## to react with a cyanating agent. According to this invention, optically active 3,4-dihydroxy butyronitrile and 3,4-dihydroxy butyric acid derivatives may be manufactured economically and efficiently.
摘要:
A compound of a 3,5,6-trihydroxyhexanoic acid derivative of the formula: ##STR1## wherein P.sup.1 and P.sup.2 are independently hydrogen atoms or hydroxy-protecting groups, or together form a ring, and R is an alkyl group is effectively prepared by a process comprising steps of:reacting a butyronitrile derivative of the formula: ##STR2## wherein P.sup.1 and P.sup.2 are the same as defined above with an .alpha.-haloacetate of the formula:X--CH.sub.2 --COOR (III) wherein X is a halogen atom, and R is the same as defined above in the presence of a metallic catalyst selected from the group consisting zinc and zinc-copper to form a keto acid derivative of the formula: ##STR3## wherein P.sup.1, P.sup.2 and R are the same as defined above, and then reducing the obtained keto-acid derivative of the formula (IV).
摘要:
A 3,4-epoxybutyrate of the formula: ##STR1## wherein R.sup.1 is an alkyl or aralkyl group is efficiently prepared by a process comprising steps of:(a) reacting 3,4-dihydroxybutyronitrile of the formula: ##STR2## with a sulfonyl chloride of the formula: R.sup.2 --SO.sub.2 --Cl wherein R.sup.2 is an alkyl group or a phenyl group which may be substituted in the presence of a base to obtain a compound of the formula: ##STR3## (b) reacting the compound prepared in the step (a) with an alcohol of the formula: R.sup.1 --OH in the presence of an acid to obtain a compound of the formula: ##STR4## and (c) reacting the compound prepared in the step (b) with a base to obtain the 3,4-epoxybutyrate.
摘要:
A process for preparing N-[1(S)-ethoxycarbonyl-3-phenylpropyl]-L-alanyl-L-proline, which comprises reacting N-carboxyanhydride of N-[1(S)-ethoxycarbonyl-3-phenylpropyl]-L-alanine with L-proline in the presence of a base. According to the process, enalapril can be prepared economically, easily and effectively.
摘要:
A novel 2,4-dihydroxyadipic acid derivative of the formula: ##STR1## wherein R.sup.1 and R.sup.4 are the same or different and each a hydrogen atom, an alkyl group, an aralkyl group, an aryl group or a silyl group, and R.sup.2 and R.sup.3 are the same or different and each a hydrogen atom or a protective group of a hydroxy group or together form a ring, which is useful as a common intermediate in the synthesis of HMG-CoA reductase inhibitor.
摘要:
A novel process for effectively preparing an optically active cyanohydrin comprising asymmetrically cyanating an aldehyde by reacting the aldehyde with a cyanating agent in the presence of a titanate of an optically active tartaric acid derivative.