Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Preparing oxygen-containing organic compound
Reexamination Certificate
2002-02-26
2004-01-27
Lilling, Herbert J. (Department: 1651)
Chemistry: molecular biology and microbiology
Micro-organism, tissue cell culture or enzyme using process...
Preparing oxygen-containing organic compound
C435S171000, C435S252330, C435S252800, C435S254220
Reexamination Certificate
active
06682916
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a process for preparing optically active chloropropanediol derivative which comprises treating an inexpensive (RS)-chloropropanediol derivative with a nitroxyl compound in the presence of an oxidant to convert to an chlorohydroxyacetone derivative, and stereospecifically reducing the chlorohydroxyacetone derivative under an enzyme source having an activity which allow an chlorohydroxy acetone derivative to be reduced, and an important intermediate thereof. An optically active chloropropanediol derivative, especially (S)-3-benzyloxy-1-chloro-2-propanol is useful compound as an intermediate of a medicine.
BACKGROUND ART
As the process for preparing chlorohydroxyacetone derivative, for example, the process for oxidizing 1-benzoyloxy-3-chloro-2-propanol with DCC (Journal of Medicinal Chemistry, (20), 5, 1997) is known. However, such process has problems of using harmful heavy metals and of low yield.
As the reduction process of chlorohydroxyacetone with, for example, a microorganism, the following processes are known. (1) A process for stereoselective reduction of 1-acetyloxy-3-chloro-2-propanone with an microorganism (JP-A-11-103878), and (2) a process for R selective reduction of 1-chloro-3-(p-acetoamidephenoxy)-2-propanone with a microorganism (JP-A-02-295970). However, these processes have a problem in stereoselectivity, productivity or the like.
As mentioned above, these processes have a problem to be improved as an industrial preparation process.
As a result of intense studies for the purpose of preparing optically active chloropropanediol derivatives, especially (S)-1-benzyloxy-3-chloro-2-propanol effectively in a high optical purity, a process for preparing an optically active chloropropanediol derivative, which comprises treating inexpensive (RS)-chloropropanediol derivative with a nitroxyl compound in the presence of an oxidant to convert to an chlorohydroxyacetone derivative, and stereospecifically reducing the chlorohydroxyacetone derivative under an enzyme source having an activity which allow an chlorohydroxy acetone derivative to be reduced, and 1-benzyloxy-3-chloro-2-propanon which is one of important intermediates thereof have been found to complete the present invention.
DISCLOSURE OF INVENTION
That is to say, the present invention relates to a chlorohydroxyacetone derivative represented by the formula (1);
wherein R
1
is an aralkyl group which may be substituted with a group having 1 to 15 carbon atoms.
In the above-mentioned chlorohydroxyacetone derivative, R
1
is preferably benzyl group or a substituted benzyl group.
The present invention also relates to a process for preparing a chlorohydroxyacetone derivative represented by formula (3);
wherein R
2
is an alkyl group having 1 to 10 carbon atoms, an aryl group which may be substituted with a group having 1 to 15 carbon atoms, an aralkyl group which may be substituted with a group having 1 to 15 carbon atoms, an alkylsulfonyl group having 1 to 10 carbon atoms, an arylsulfonyl group which may be substituted with a group having 1 to 15 carbon atoms, an alkylcarbonyl group having 1 to 10 carbon atoms or an arylcarbonyl group which may be substituted with a group having 1 to 15 carbon atoms,
which comprises allowing a chloropropanediol derivative represented by the formula (2);
wherein R
2
is the same as the defined above, to react with a nitroxyl compound represented by the formula (7);
wherein each of R
4
, R
5
, R
6
and R
7
is an alkyl group which may be the same or different, R
8
is hydrogen atom or electron-releasing group, in the presence of an oxidizing agent.
Furthermore, the present invention relates to a process for preparing an optically active chloropropanediol derivative represented by the formula (4);
wherein R
2
is the same as the mentioned above, which comprises allowing chlorohydroxy acetone derivative represented by the formula (3) obtained by the above-mentioned preparing process to be stereospecifically reduced in the presence of an enzyme source having an activity to reduce it stereospecifically.
Additionally, the present invention relates to a process for preparing an optically active chloropropanediol derivative represented by the formula (6);
wherein R
3
is an alkyl group having 1 to 10 carbon atoms, an aryl group which may be substituted with a group having 1 to 15 carbon atoms, an aralkyl group which may be substituted with a group having 1 to 15 carbon atoms, an alkylsulfonyl group having 1 to 15 carbon atoms, an arylsulfonyl group which may be substituted with a group having 1 to 15 carbon atoms, which comprises allowing a chlorohydroxyacetone derivative represented by the formula (5);
wherein R
3
is the same as the mentioned above, to be stereospecifically reduced in the presence of an enzyme source having an activity to reduce the chlorohydroxy acetone derivative represented by the above-mentioned formula (5) stereospecifically.
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is explained in detail below.
In the aralkyl group which may be substituted with a group having 1 to 15 carbon atoms represented by R
1
in the formula (1), the aralkyl group include benzyl group, phenylethyl group, phenylpropyl group, naphthylmethyl group. Among them, benzyl group is preferable. The substituent of the aralkyl group includes an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an acyl group having 1 to 10 carbon atoms, an aliphatic amide group having 1 to 5 carbon atoms, an aliphatic ether having 1 to 5 carbon atoms, an unsaturated aliphatic ether having 1 to 5 carbon atoms, a halogen atom such as fluorine, chlorine, iodine or bromine, hydroxyl group, thiol group, nitro group, amino group, cyano group, an aryl group such as phenyl group or naphthyl group. Among them, the halogen atom such as fluorine, chlorine, iodine or bromine is preferable.
In the compounds represented by each of the formula (2) to (6), the alkyl group having 1 to 10 carbon atoms represented by R
2
or R
3
includes methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, t-butyl group or the like. Among them, t-butyl group is preferable. In the aryl group which may be substituted with a group having 1 to 15 carbon atoms, the aryl group includes phenyl group, naphthyl group, pyridyl group, indolinyl group or the like. Among them, phenyl group is preferable. The substituent of the aryl group includes an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an acyl group having 1 to 10 carbon atoms, an aliphatic amide group having 1 to 5 carbon atoms, an aliphatic ether having 1 to 5 carbon atoms, an unsaturated aliphatic ether having 1 to 5 carbon atoms, a halogen atom such as fluorine, chlorine, iodine or bromine, hydroxyl group, thiol group, nitro group, amino group, cyano group, an aryl group such as phenyl group or naphthyl group. Among them, the halogen atom such as fluorine, chlorine, iodine or bromine is preferable. The number of substituents is preferably 0 to 3. As the alkylsulfonyl group having 1 to 15 carbon atoms, methane sulfonyl group is preferable. The arylsulfonyl group which may be substituted with a group having 1 to 15 carbon atoms includes phenylsulfonyl group, p-toluenesulfonyl group or p-nitruphenylsulfonyl group. Among them, p-toluenesulfonyl group is preferable.
In the compounds represented by each of the formula (2) to (4), the alkylcarbonyl group having 1 to 10 carbon atoms represented by R
2
includes acetyl group, ethylcarbonyl group, propylcarbonyl group or the like. Among them, acetyl group is preferable. The arylcarbonyl group which may be substituted with a group having 1 to 15 carbon atoms includes p-bromobenzoly group or the like. Among them, benzoyl group and p-nitrobenzoly group are preferable.
It is known that, chloropropanediol derivative used as a raw material and represented by the formula (2) in the present invention, for example, (RS)-1-chloro-3-benzyloxy-2-propanol can be easily prepared by allo
Maeda Hironobu
Okuro Kazumi
Taoka Naoaki
Toyota Koichiro
Yasohara Yoshihiko
Armstrong Westerman & Hattori, LLP
Kaneka Corporation
Lilling Herbert J.
LandOfFree
Chlorohydroxyacetone derivative and process for producing... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Chlorohydroxyacetone derivative and process for producing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chlorohydroxyacetone derivative and process for producing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3253369