Abstract:
A process for obtaining therapeutically active 2-[4-(3- and 2- (fluorobenzyloxy)benzylamino]propanamides and their salts with pharmaceutically acceptable acids with high purity degree, in particular, with a content of dibenzyl derivatives impurities lower than 0.03%, preferably lower than 0.01% by weight. The process is carried out by submitting the Schiff bases intermediates 2- [4-(3- and 2-fluorobenzyloxy)benzylideneamino]propanamides to catalytic hydrogenation in the presence of a heterogeneous catalyst in a protic organic solvent.
Abstract:
Process for preparing itopride hydrochloride comprising: a) Reacting 4-hydroxybenzaldehyde with 2-dimethylaminoethyl chloride in the 5 presence of a weak inorganic base to obtain 4-(2-dimethylaminoethoxy)- benzaldehyde, b) Reacting 4-(2-dimethylaminoethoxy)-benzaldehyde with hydroxylamine hydrochloride in an acid environment to obtain 4-(2-dimethylaminoethoxy)- benzaldoxime hydrochloride, 10 c) Reacting of 4-(2-dimethylaminoethoxy)-benzaldoxime hydrochloride in the presence a reducing agent to 4-(2-dimethylaminoethoxy)-benzylamine, d) Reacting 4-(2-dimethylaminoethoxy)-benzylamine with veratric acid chloride in the presence of a tertiary amine to obtain itopride, e) Salifying itopride with hydrochloric acid to obtain itopride hydrochloride, 15 characterized in that the reducing agent employed in step (c) is powdered zinc.
Abstract:
A process for producing an asymmetric compound (IV), characterized by causing a compound (II) to add a nucleophilic reagent (III) through conjugate addition in the presence of an asymmetric urea compound (I). Also provided is a nonmetallic asymmetric catalyst capable of realizing asymmetric conjugate addition reaction which attain high yield and are highly stereoselective. The process is an advantageous process for producing an asymmetric compound by an asymmetric conjugate addition reaction in which the catalyst is used. [In the formulae, X represents oxygen or sulfur; C*, C**, and C*** each indicates asymmetric carbon; R , R , R , R , R , R , and R each represents optionally substituted lower alkyl, etc., provided that, for example, R and R may be bonded to each other to form an optionally substituted homocycle, etc.; R represents optionally substituted aryl, etc.; R and R each represents hydrogen, etc.; Nu represents -CR (COR )(COR ) (wherein R , R , and R each represents optionally substituted lower alkyl, etc.), etc.; and EWG represents an electron-withdrawing group.]
Abstract translation:一种不对称化合物(Ⅳ)的制造方法,其特征在于,在不对称脲化合物(I)的存在下,使化合物(II)通过共轭加成而添加亲核试剂(III)。 还提供能够实现高收率且高度立体选择性的非对称共轭加成反应的非金属不对称催化剂。 该方法是通过其中使用催化剂的不对称共轭加成反应制备不对称化合物的有利方法。 [式中,X表示氧或硫; C *,C **和C ***各自表示不对称碳; R 1,R 2,R 4,R 5,R 8,R 9和R 10各自表示任选取代的低级烷基等,条件是例如 R 4和R 5可以彼此键合以形成任选取代的杂环等; R 3表示任选取代的芳基等; R 6和R 7各自表示氢等; Nu表示-CR 16(COR 17)(COR 18)(其中R 16,R 17和R 18各自表示任选取代的低级烷基等)等; EWG表示吸电子基团。]
Abstract:
A process for producing an asymmetric compound (IV), characterized by causing a compound (II) to add a nucleophilic reagent (III) through conjugate addition in the presence of an asymmetric urea compound (I). Also provided is a nonmetallic asymmetric catalyst capable of realizing asymmetric conjugate addition reaction which attain high yield and are highly stereoselective. The process is an advantageous process for producing an asymmetric compound by an asymmetric conjugate addition reaction in which the catalyst is used. [In the formulae, X represents oxygen or sulfur; C*, C**, and C*** each indicates asymmetric carbon; R , R , R , R , R , R , and R each represents optionally substituted lower alkyl, etc., provided that, for example, R and R may be bonded to each other to form an optionally substituted homocycle, etc.; R represents optionally substituted aryl, etc.; R and R each represents hydrogen, etc.; Nu represents -CR (COR )(COR ) (wherein R , R , and R each represents optionally substituted lower alkyl, etc.), etc.; and EWG represents an electron-withdrawing group.]
Abstract translation:一种不对称化合物(Ⅳ)的制造方法,其特征在于,在不对称脲化合物(I)的存在下,使化合物(II)通过共轭加成而添加亲核试剂(III)。 还提供能够实现高收率且高度立体选择性的非对称共轭加成反应的非金属不对称催化剂。 该方法是通过其中使用催化剂的不对称共轭加成反应制备不对称化合物的有利方法。 [式中,X表示氧或硫; C *,C **和C ***各自表示不对称碳; R 1,R 2,R 4,R 5,R 8,R 9和R 10各自表示任选取代的低级烷基等,条件是例如 R 4和R 5可以彼此键合以形成任选取代的杂环等; R 3表示任选取代的芳基等; R 6和R 7各自表示氢等; Nu表示-CR 16(COR 17)(COR 18)(其中R 16,R 17和R 18各自表示任意取代的低级烷基等)等; EWG表示吸电子基团。]
Abstract:
Amino acid-N-carboxy anhydrides having an N-acyl substituent at nitrogen which are represented by the following general formula (1); and a process for producing the same. These compounds easily react with free amino acids, alcohols or nucleophilic agents such as anions and serve as useful intermediates in producing amino acid derivatives, optically active compounds, peptides, polypeptides and the like, which are useful in various fields including medicines and pesticides, at a high yield. Moreover, a process for producing diamides by using the compounds of the formula (1) with amine derivatives represented by the following general formula (7). These diamides are also appropriately usable in producing amino acid derivatives, optically active compounds, peptides, polypeptides and the like.
Abstract:
A method for the solid phase synthesis of compounds of formula (1), in which either or both of R1 or R2 are combinatorially variable by a process represented by scheme (4) and wherein: X is (a), (b), (c) or (d); Y is H or a side chain functional group protective moiety such as Fmoc; R21 is an intermediate form of R2 which is subsequently chemically transformed to give the desired R2; and n is between 2 and 12, preferably 4. The invention also provides compounds and combinatorial libraries of compounds of formula (1), as well as intermediate compounds for use in the method.
Abstract:
A ring contraction approach is applied to preparation of cyclopentane derivatives, especially 2,2,5,5-tetra-methylcyclopentanecarboxylic acid from cyclohexane compounds. In one aspect, a cyclohexane diazoketone is reacted with an amine (e.g., an alanine ester) to form the corresponding cyclopentane acid amide.
Abstract:
The present invention disclosed a process for the synthesis of compound of formula (Z) or a salt thereof, wherein, R, R1, R2, R3 and R10 are as defined in the detailed description. The process further comprises the synthesis of an anthranilic diamide compound of formula (I).