摘要:
The invention relates to novel 2-oxo-1-oxa-8-azaspiro[4,5]decane derivatives of the formula (I), ##STR1## wherein X means oxygen or an >NR group, whereinR stands for hydrogen; a C.sub.1-12 alkyl; C.sub.3-6 cycloalkyl; carbocyclic C.sub.6-10 aryl or carbocyclic C.sub.6-10 aryl-C.sub.1-4 alkyl group, the two latter two substituents optionally substituted on their aromatic moiety by one or more, same or different halogen, one or more C.sub.1-4 alkyl, C.sub.1-4 alkoxy or trihalomethyl group; or a tosyl group;R.sup.1 and R.sup.2 together represent a methylene group or, when X stands for an >NR group wherein R is as defined above, one of R.sup.1 and R.sup.2 m may represent a hydroxyl group and the other one is a methyl group; andR.sup.3 means hydrogen, benzyl, (C.sub.1-4 alkoxy)carbonyl, phenoxycarbonyl, benzyloxycarbonyl, formyl, piperidin-1-ylcarbonyl, morpholin-4-ylcarbonyl, 4-methylpiperazin-1-ylcarbonyl, 4-(2-hydroxethyl)piperazin-1-ylcarbonyl, 2-chloro-3-nicotinoylcarbamoyl or C.sub.1-6 alkylcarbamoyl group,as well as their acid addition and quaternary ammonium salts.
摘要:
The invention relates to N-(trans-4-isopropylcyclohexylcarbonyl)-D-phenylalanine (nateglinide) in the novel crystalline form “G” and a process for the preparation thereof. A process for the preparation of chirally pure nateglinide by treating a lower alkyl ester thereof with a base to yield an alkali salt and liberating the product from said salt by proper addition of an acid, is also provided. Still another aspect of the invention is a process for the preparation of nateglinide in the crystalline form “H” from other crystalline modifications of nateglinide.
摘要:
The invention relates to N-(trans-4-isopropylcyclohexylcarbonyl)-D-phenylalanine (nateglinide) in the novel crystalline form “G” and a process for the preparation thereof. A process for the preparation of chirally pure nateglinide by treating a lower alkyl ester thereof with a base to yield an alkali salt and liberating the product from said salt by proper addition of an acid, is also provided. Still another aspect of the invention is a process for the preparation of nateglinide in the crystalline form “H” from other crystalline modifications of nateglinide.
摘要:
The invention relates to N-(trans-4-isopropylcyclohexylcarbonyl)-D-phenylalanine (nateglinide) in the novel crystalline form “G” and a process for the preparation thereof. A process for the preparation of chirally pure nateglinide by treating a lower alkyl ester thereof with a base to yield an alkali salt and liberating the product from said salt by proper addition of an acid, is also provided. Still another aspect of the invention is a process for the preparation of nateglinide in the crystalline form “H” from other crystalline modifications of nateglinide.
摘要:
A hot drying agent discharged from the section for material transport of the bound moisture, having a low moisture content, is recirculated to the front part of the drying area; the moisture content of both of the fed and discharged material is measured and by means of the differential-analogue signal thus obtained the stream of the material to be dried and in a given case the heating of the drying agent is controlled. An apparatus for performing the drying operation is also provided.