seven chiral azolinium and five functionalized chiral azolinium salts, precursors to N-heterocyclic carbenes, derived from l-proline has been developed. Moderate to good overall yields were obtained. Some NHC dimers and thiones were isolated. X-ray crystal structure determinations of two [Rh-NHC] complexes were also reported. A short and flexible procedure for the preparation of seven chiral azolinium
Prolinamides of formula (1)
wherein R is hydrogen, R₁ is a straight or branched C₂-C₅ alkyl group, ω-substituted with a hydroxyl or carboxyl group optionally esterified with a C₂-C₅ alkanol, or an amino group substituted with one or two straight or branched C₂-C₅ alkyl groups or an amino acid residue, or a 5- or 6- membered heterocyclic group wherein the heteroatom is sulphur or nitrogen, or R and R₁ taken together form a rin of formula
wherein R₃ is a phenyl group optionally substituted with halogens or halogen-substituted lower C₁-C₄ alkyl groups, and R₂ is hydrogen, benzyloxycarbonyl or formyl, are potent enhancers of learning and memory processes.
4-Substituted-2-azetidinone compound, process of producing the
申请人:Yamanouchi Pharmaceutical Co., Ltd.
公开号:US04564609A1
公开(公告)日:1986-01-14
A novel 4-substituted-2-azetidinone compound shown by the general formula ##STR1## and salts thereof. The compounds of this invention have a strong CNS activity and are useful for improving a disturbance of consciousness in schizophrenia, a head injury, etc., or improving hypobulia, memory loss, etc.
A novel-4-substituted-2-azetidinone compound shown by the general formula ##STR1## and salts thereof. The compounds of this invention have a strong CNS activity and are useful for improving a disturbance of consciousness in schizophrenia, a head injury, etc., or improving hypobulia, memory loss, etc.
4-substituted-2-azetidinone compound, process of producing the
申请人:Yamanouchi Pharmaceutical Co., Ltd.
公开号:US04610821A1
公开(公告)日:1986-09-09
A novel 4-substituted-2-azetidinone compound shown by the general formula ##STR1## and salts thereof. The compounds of this invention have a strong CNS activity and are useful for improving a disturbance of consciousness in shizophrenia, a head injury, etc., or improving hypobulia, memory loss, etc.