摘要:
Processes for industrially producing (aminomethyl)trifluoromethylcarbinol derivatives (I), in particular, optically active compounds, which are useful as materials for producing drugs such as proteases. A process for producing the compound (I) characterized by starting with a 1,3-oxazolidin-5-one derivative (III), which is easily derived from an α-amino acid, and effecting the reaction either stepwise or in one spot; and another process for producing compound (I) characterized by reducing a 5-hydroxy compound (II): a: trialkyl; b: reduction wherein R1 represents a group corresponding to a side chain moiety of a natural or unnatural α-amino acid; and R2 represents hydrogen or R21 (wherein R21 represents an amino-protective group having carbonyl at the binding site to the nitrogen atom).
摘要:
Heterocyclic compounds represented by general formula (I-a), its esters or salts thereof; and human neutrophilic elastase inhibitors, etc. containing the same as the active ingredient wherein A and B are the same of different and each represents lower alkylene optionally substituted by oxo; D represents a monocyclic or dicyclic heterocyclic group optionally substituted by oxo; R?1 and R2¿ are the same or different and each represents lower alkyl; R?3 and R4¿ are different from each other and each represents hydrogen or hydroxy, or R?3 and R4¿ form together oxo; and R5 represents 2-benzoxasolyl, trifluoromethyl, benzylaminocarbonyle, etc.