摘要:
A process for preparing N-substituted amino acid esters having the formula (I): ##STR1## wherein R.sub.1 and R.sub.4, the same or different, are an alkyl, aralkyl, cycloalkyl or aryl group; and R.sub.2 and R.sub.3, the same or different,are an alkyl, aralkyl, aryl, heterocycle-alkyl, aminoalkyl or guanidylalkyl, by the reaction of .alpha.-amino acid esters with .alpha.-substituted carboxylic acid esters, under the condition of substantially free from solvent, which can afford their optical isomers in a good yield.
摘要:
A process for the preparation of .alpha.-hydroxyketones ##STR1## having a high purity in a good yield from a compound ##STR2## by rearrangement reaction in aqueous alkaline solution, where R.sub.1 and R.sub.3 each represent an alkyl, alkenyl or aryl group, R.sub.2 represents a hydrogen atom or an alkyl, alkenyl or aryl group, and X represents hydroxyl group or a halogen atom.
摘要:
An (S)-1-phenyl-2-substituted propane derivative shown by the following formula (I) ##STR1## wherein R.sup.1 and R.sup.2 represent a lower alkyl group, etc., or R.sup.1 and R.sup.2 may form together an alkylene group, etc.; R.sup.3, R.sup.4 and R.sup.5 represent a hydrogen atom, etc.; and X represents a hydroxyl group which may be protected with a protective group, or a halogen atom etc., can readily be produced (i) by permitting a microorganism belonging to the genus Torulaspora, the genus Candida, the genus Pichia or the like to act on a phenylacetone derivative and asymmetrically reducing the compound, or (ii) by sterically inverting an (R)-enantiomer. (R,R)-1-phenyl-2-�(2-phenyl-1-methylethyl)amino!ethanol derivative having a high optical purity can easily be obtained from the compound of the formula (I). The ethanol derivative is useful as an anti-obesity agent and the like.
摘要:
An (S)-1-phenyl-2-substituted propane derivative shown by the following formula (I) ##STR1## wherein R.sup.1 and R.sup.2 represent a lower alkyl group, etc., or R.sup.1 and R.sup.2 may form together an alkylene group, etc.; R.sup.3, R.sup.4 and R.sup.5 represent a hydrogen atom, etc.; and X represents a hydroxyl group which may be protected with a protective group, or a halogen atom etc., can readily be produced (i) by permitting a microorganism belonging to the genus Torulaspora, the genus Candida, the genus Pichia or the like to act on a phenylacetone derivative and asymmetrically reducing the compound, or (ii) by sterically inverting an (R)-enantiomer. (R,R)-1-phenyl-2-[(2-phenyl-1-methylethyl)amino]ethanol derivative having a high optical purity can easily be obtained from the compound of the formula (I). The ethanol derivative is useful as an anti-obesity agent and the like.
摘要:
A sulfonamide compound of the formula (I): R1—SO2NHCO—A—X—R2 (I) wherein R1 is alky, alkenyl, alkynyl and the like; A is an optionally substitutedheteropolycyclic group except benzimidazolyl, indolyl, 4,7-dihydrobenzimidazolyland 2,3-dihydrobenzoxazinyl; X is alkylene, oxa, oxa(lower)alkylene and the like; and R2 is optionally substituted aryl, substituted biphenylyl and the like, a salt thereof and a pharmaceutical composition comprising the same. The sulfonamide compound is effective for the diseases treatable based on their blood sugar level-depressing activity, cGMP-PDE (especially PDE-V)-inhibiting activity, smooth muscle relaxing activity, bronchodilating activity, vasodilating activity, smooth muscle cell suppressing activity, and antiallergic activity.
摘要:
The present invention relates to a sulfonamide compound of the formula (I): wherein each symbol is as defined in the specification, a salt thereof, and a pharmaceutical composition containing same. This compound can be an effective agent for the prophylaxis and treatment of the diseases curable based on a hypoglycemic action, and the diseases curable based on a cGMP-PDE inhibitory action, a smooth muscle relaxing action, a bronchodilating action, a vasodilating action, a smooth muscle cell inhibitory action and an allergy suppressing action.
摘要:
A novel benzimidazole derivative or a salt thereof is provided, which is represented by the formula: wherein R1 represents an alkyl group, etc., R2 represents a substituted or unsubstituted aromatic lower alkyl group, R3 represents an alkyl group, etc., and -X- is represented by the following formula (V): etc. This derivative or a salt thereof is useful as medicine.
摘要:
A sulfonamide compound of the formula (I): R1—SO2NHCO—A—X—R2 (I) wherein R1 is alky, alkenyl, alkynyl and the like; A is an optionally substitutedheteropolycyclic group except benzimidazolyl, indolyl, 4,7-dihydrobenzimidazolyland 2,3-dihydrobenzoxazinyl; X is alkylene, oxa, oxa(lower)alkylene and the like; and R2 is optionally substituted aryl, substituted biphenylyl and the like, a salt thereof and a pharmaceutical composition comprising the same. The sulfonamide compound is effective for the diseases treatable based on their blood sugar level-depressing activity, cGMP-PDE (especially PDE-V)-inhibiting activity, smooth muscle relaxing activity, bronchodilating activity, vasodilating activity, smooth muscle cell suppressing activity, and antiallergic activity.
摘要:
3-(2,4-Dichlorobenzyl)-2-methyl-N-(pentylsulfonyl)-3H-benzimidazole-5-carboxamide, a compound having hypoglycemic activity or PDE5 inhibitory effect, has three forms of crystal forms that are distinguishable by their X-ray powder diffraction values. The most crystallographically stable crystal form is useful as a drug substance for medicines. Another crystal form can be purified efficiently by crystallization, since it forms larger crystals and can be very easily isolated by filtration. Thus this crystal form is useful for purifying 3-(2,4-Dichlorobenzyl)-2-methyl-N-(pentylsulfonyl)-3H-benzimidazole-5-carboxamide.
摘要:
An (R)-2-amino-1-phenylethanol derivative shown by the general formula (IIa) wherein R1 and R5 represent a hydrogen atom, etc.; R2, R3 and R4 independently represent a halogen atom, etc., or a salt thereof, can readily be produced (1) by permitting a microorganism belonging to the genus Rhodosporidium, the genus Comamonas or the like to act on a mixture of corresponding (R)-form and (S)-form to asymmetrically utilize, or (2) by permitting a microorganism belonging to the genus Lodderomyces, the genus Pilimelia or the like to act on a corresponding aminoketone derivative to asymmetrically reduce. An (R,R)-1-phenyl-2-[(2-phenyl-1-alkylethyl)amino]ethanol derivative having a high optical purity can easily be obtained from the compound of the formula (IIa) or a salt thereof. Said derivative is useful as an intermediate for producing an anti-obesity agent and so on.